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ELON MUSK ON WHY SPACE SOLAR IS ESSENTIAL FOR KARDASHEV PROGRESS “To make any progress on a Kardashev 2 scale… you really have to have your solar power in deep space.” These late 2025 comments remain central as AI energy demands grow and orbital deployments advance into 2026. He...

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Lacey

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1,470,894 次观看 • 6 个月前 •via X (Twitter)

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Here's Elon Musk explaining why we'll have to move AI to deep space. “I see a path to Starship cost-per-ton-to-orbit being lower than air flight. That opens up a very wide range of possibilities. The most obvious one I think is actually solar-powered AI satellites. So, to move the AI to orbit and essentially deep space over time, because you can actually access over a billion times more energy from the sun in deep space than you can on Earth. To scale to Kardashev, to make any progress on a Kardashev 2 scale, which is using some non-trivial amount of energy from the sun, you kind of have to do space solar power. You could only beam a tiny amount of that back to Earth or you would melt Earth. Earth actually receives a very, very tiny amount of the sun's energy. I mean, Earth is a tiny dust mote. Earth, to scale with the sun, we look like a little crumb. So, to scale civilization, to be at all relevant on a Kardashev 2 scale, like to even use a millionth of a percent of the Sun's energy, you really have to have your solar power in deep space.” Tesla Shareholder Meeting, November 6, 2025
1:26

Here's Elon Musk explaining why we'll have to move AI to deep space. “I see a path to Starship cost-per-ton-to-orbit being lower than air flight. That opens up a very wide range of possibilities. The most obvious one I think is actually solar-powered AI satellites. So, to move the AI to orbit and essentially deep space over time, because you can actually access over a billion times more energy from the sun in deep space than you can on Earth. To scale to Kardashev, to make any progress on a Kardashev 2 scale, which is using some non-trivial amount of energy from the sun, you kind of have to do space solar power. You could only beam a tiny amount of that back to Earth or you would melt Earth. Earth actually receives a very, very tiny amount of the sun's energy. I mean, Earth is a tiny dust mote. Earth, to scale with the sun, we look like a little crumb. So, to scale civilization, to be at all relevant on a Kardashev 2 scale, like to even use a millionth of a percent of the Sun's energy, you really have to have your solar power in deep space.” Tesla Shareholder Meeting, November 6, 2025

ELON CLIPS

30,799 次观看 • 7 个月前

“ As we progress along the Kardashev Scale, energy harnessed on Earth will increase a hundredfold and will mostly be solar aka fusion aka starlight. Then energy harnessed will increase perhaps a billionfold if we make it to Kardashev II, with space solar power, and another billionfold if we harness the energy of our galaxy 🌌 .” — Elon Musk
1:00

“ As we progress along the Kardashev Scale, energy harnessed on Earth will increase a hundredfold and will mostly be solar aka fusion aka starlight. Then energy harnessed will increase perhaps a billionfold if we make it to Kardashev II, with space solar power, and another billionfold if we harness the energy of our galaxy 🌌 .” — Elon Musk

Rui Huang

136,720 次观看 • 10 个月前

Elon Musk: Thanks to Starship, we'll be able to move AI to deep space. “I see a path to Starship cost-per-ton-to-orbit being lower than air flight. That opens up a very wide range of possibilities. The most obvious one I think is actually solar-powered AI satellites. So, to move the AI to orbit and essentially deep space over time, because you can actually access over a billion times more energy from the sun in deep space than you can on Earth. To scale to Kardashev, to make any progress on a Kardashev 2 scale, which is using some non-trivial amount of energy from the sun, you kind of have to do space solar power. You could only beam a tiny amount of that back to Earth or you would melt Earth. Earth actually receives a very, very tiny amount of the sun's energy. I mean, Earth is a tiny dust mote. Earth, to scale with the sun, we look like a little crumb. So, to scale civilization, to be at all relevant on a Kardashev 2 scale, like to even use a millionth of a percent of the Sun's energy, you really have to have your solar power in deep space.” Tesla Shareholder Meeting, November 6, 2025
1:27

Elon Musk: Thanks to Starship, we'll be able to move AI to deep space. “I see a path to Starship cost-per-ton-to-orbit being lower than air flight. That opens up a very wide range of possibilities. The most obvious one I think is actually solar-powered AI satellites. So, to move the AI to orbit and essentially deep space over time, because you can actually access over a billion times more energy from the sun in deep space than you can on Earth. To scale to Kardashev, to make any progress on a Kardashev 2 scale, which is using some non-trivial amount of energy from the sun, you kind of have to do space solar power. You could only beam a tiny amount of that back to Earth or you would melt Earth. Earth actually receives a very, very tiny amount of the sun's energy. I mean, Earth is a tiny dust mote. Earth, to scale with the sun, we look like a little crumb. So, to scale civilization, to be at all relevant on a Kardashev 2 scale, like to even use a millionth of a percent of the Sun's energy, you really have to have your solar power in deep space.” Tesla Shareholder Meeting, November 6, 2025

ELON CLIPS

14,003 次观看 • 7 个月前

ELON MUSK: "The most obvious one is actually solar powered AI satellites, sort of to move the AI to orbit and essentially deep space over time, because there you can actually access over a billion times more energy from the sun in deep space than you can on Earth. The scaling to Kardashev, which is using some non trivial amount of energy from the sun. You kind of have to do space solar power. Like to even use a millionth of a percent of the sun's energy you you really have to be have your solar power in deep space."
1:41

ELON MUSK: "The most obvious one is actually solar powered AI satellites, sort of to move the AI to orbit and essentially deep space over time, because there you can actually access over a billion times more energy from the sun in deep space than you can on Earth. The scaling to Kardashev, which is using some non trivial amount of energy from the sun. You kind of have to do space solar power. Like to even use a millionth of a percent of the sun's energy you you really have to be have your solar power in deep space."

DogeDesigner

266,777 次观看 • 8 个月前

ELON: TO SCALE CIVILIZATION, WE’LL HAVE TO MOVE AI TO DEEP SPACE “I see a path to Starship cost-per-ton-to-orbit being lower than air flight. That opens up a very wide range of possibilities. The most obvious one I think is actually solar-powered AI satellites. To move the AI to orbit and essentially deep space over time, because you can actually access over a billion times more energy from the sun in deep space than you can on Earth. To make any progress on a Kardashev 2 scale, which is using some non-trivial amount of energy from the sun, you kind of have to do space solar power. You could only beam a tiny amount of that back to Earth or you would melt Earth. Earth actually receives a very, very tiny amount of the sun's energy. Earth is a tiny dust mote. Tto scale with the sun, we look like a little crumb. So, to scale civilization, to be at all relevant on a Kardashev 2 scale, like to even use a millionth of a percent of the Sun's energy, you really have to have your solar power in deep space.” Source: Tesla Shareholder Meeting, November 6, 2025
1:27

ELON: TO SCALE CIVILIZATION, WE’LL HAVE TO MOVE AI TO DEEP SPACE “I see a path to Starship cost-per-ton-to-orbit being lower than air flight. That opens up a very wide range of possibilities. The most obvious one I think is actually solar-powered AI satellites. To move the AI to orbit and essentially deep space over time, because you can actually access over a billion times more energy from the sun in deep space than you can on Earth. To make any progress on a Kardashev 2 scale, which is using some non-trivial amount of energy from the sun, you kind of have to do space solar power. You could only beam a tiny amount of that back to Earth or you would melt Earth. Earth actually receives a very, very tiny amount of the sun's energy. Earth is a tiny dust mote. Tto scale with the sun, we look like a little crumb. So, to scale civilization, to be at all relevant on a Kardashev 2 scale, like to even use a millionth of a percent of the Sun's energy, you really have to have your solar power in deep space.” Source: Tesla Shareholder Meeting, November 6, 2025

Mario Nawfal

1,587,488 次观看 • 7 个月前

Elon Musk: The sun generates a billion times more energy than everything on Earth combined. “As soon as you start thinking about things at a grander scale, like Kardashev Scale 2 civilizations, it becomes very obvious. Anyone who studies physics has known this for a very long time. Kardashev was a Russian physicist who came up with this idea in the 60s, as a way to classify civilizations. - Kardashev Scale 1: You've harnessed most of the energy of the planet. - Kardashev Scale 2: You've harnessed most of the energy of your sun. - Kardashev Scale 3: You've harnessed most of the energy of your galaxy. We're only about 1% or a few percent of Kardashev Scale 1 right now, optimistically. But as soon as you go to Kardashev Scale 2, then you're really just saying everything is solar power and the rest is in the noise. The sun produces about a billion times more energy than everything on Earth combined.” All-In Podcast, October 31, 2025
0:56

Elon Musk: The sun generates a billion times more energy than everything on Earth combined. “As soon as you start thinking about things at a grander scale, like Kardashev Scale 2 civilizations, it becomes very obvious. Anyone who studies physics has known this for a very long time. Kardashev was a Russian physicist who came up with this idea in the 60s, as a way to classify civilizations. - Kardashev Scale 1: You've harnessed most of the energy of the planet. - Kardashev Scale 2: You've harnessed most of the energy of your sun. - Kardashev Scale 3: You've harnessed most of the energy of your galaxy. We're only about 1% or a few percent of Kardashev Scale 1 right now, optimistically. But as soon as you go to Kardashev Scale 2, then you're really just saying everything is solar power and the rest is in the noise. The sun produces about a billion times more energy than everything on Earth combined.” All-In Podcast, October 31, 2025

ELON CLIPS

55,225 次观看 • 3 个月前

"The way to think of AI in space is that in order to achieve any meaningful percentage of a Kardashev 2 scale civilization where you're using even a millionth of a billionth of the sun's energy. You must have solar powered AI satellites and in deep space." - Elon Musk The Kardashev Scale: Type I Civilization: capable of using all the energy available on its planet. Type II Civilization: capable of harnessing all the energy emitted by its star. Type III Civilization: capable of using all the energy available in its galaxy. by Grok Imagine
1:22

"The way to think of AI in space is that in order to achieve any meaningful percentage of a Kardashev 2 scale civilization where you're using even a millionth of a billionth of the sun's energy. You must have solar powered AI satellites and in deep space." - Elon Musk The Kardashev Scale: Type I Civilization: capable of using all the energy available on its planet. Type II Civilization: capable of harnessing all the energy emitted by its star. Type III Civilization: capable of using all the energy available in its galaxy. by Grok Imagine

Déborah

11,246 次观看 • 6 个月前

Elon Musk: “In order to make some progress on the Kardashev scale, we need to launch satellites to orbit earth and capture solar power, and that avoids the needs to build massive power plants on earth and deal with cooling. Cooling is much easier in space. What we intend to do is to climb the Kardashev scale.”
0:58

Elon Musk: “In order to make some progress on the Kardashev scale, we need to launch satellites to orbit earth and capture solar power, and that avoids the needs to build massive power plants on earth and deal with cooling. Cooling is much easier in space. What we intend to do is to climb the Kardashev scale.”

Sawyer Merritt

137,275 次观看 • 28 天前

KARDASHEV SCALE: MUSK'S COSMIC BLUEPRINT Unlocking solar power for AI dominance. "To achieve any meaningful percentage of a Kardashev II civilization, where you're using even a millionth of the sun's energy, you must have solar-powered AI satellites in deep space. Earth receives only one two-billionth of the sun's output. If you want a million times more energy, you must go into space." Musk leaning on the Kardashev scale isn’t just tech talk—it’s him showing his hand. He’s thinking past the limits of this one small world, turning AI into something that pulls power from the stars instead of being trapped by Earth’s ceilings. And the irony is almost beautiful: real abundance doesn’t live here at all. It lives out there, waiting, pushing us to think bigger than survival and start imagining expansion. Moments like this hit different—equal parts scientific clarity and fearless imagination. It’s the purest glimpse of Musk’s obsession with pushing humanity into the interstellar future he refuses to stop chasing. How close are we to harnessing the sun's full power through Musk's AI vision? ⚡ Source: Elon Musk discussion with Jensen Huang, November 19, 2025 — Topic: Energy scalability for AI in space.
1:01

KARDASHEV SCALE: MUSK'S COSMIC BLUEPRINT Unlocking solar power for AI dominance. "To achieve any meaningful percentage of a Kardashev II civilization, where you're using even a millionth of the sun's energy, you must have solar-powered AI satellites in deep space. Earth receives only one two-billionth of the sun's output. If you want a million times more energy, you must go into space." Musk leaning on the Kardashev scale isn’t just tech talk—it’s him showing his hand. He’s thinking past the limits of this one small world, turning AI into something that pulls power from the stars instead of being trapped by Earth’s ceilings. And the irony is almost beautiful: real abundance doesn’t live here at all. It lives out there, waiting, pushing us to think bigger than survival and start imagining expansion. Moments like this hit different—equal parts scientific clarity and fearless imagination. It’s the purest glimpse of Musk’s obsession with pushing humanity into the interstellar future he refuses to stop chasing. How close are we to harnessing the sun's full power through Musk's AI vision? ⚡ Source: Elon Musk discussion with Jensen Huang, November 19, 2025 — Topic: Energy scalability for AI in space.

Lacey

697,317 次观看 • 7 个月前

ELON MUSK: If you want million times more energy, then you must go to space "The way to think of AI in space is that in order to achieve any meaningful percentage of a Kardashev Type 2 civilization, where you are using even a millionth of the sun's energy, you must have solar-powered AI satellites in deep space Once you think in terms of a Kardashev Type 2 civilization, which is 'what percentage of the sun's energy are you turning into useful work,' then it becomes obvious that space is overwhelmingly what matters Earth only receives roughly one two-billionth of the sun's energy. So, if you want to have something that is, say, a million times more energy than Earth could possibly produce, you must go into space. And so, it’s kind of handy to have a space company, I guess"
1:00

ELON MUSK: If you want million times more energy, then you must go to space "The way to think of AI in space is that in order to achieve any meaningful percentage of a Kardashev Type 2 civilization, where you are using even a millionth of the sun's energy, you must have solar-powered AI satellites in deep space Once you think in terms of a Kardashev Type 2 civilization, which is 'what percentage of the sun's energy are you turning into useful work,' then it becomes obvious that space is overwhelmingly what matters Earth only receives roughly one two-billionth of the sun's energy. So, if you want to have something that is, say, a million times more energy than Earth could possibly produce, you must go into space. And so, it’s kind of handy to have a space company, I guess"

X Freeze

84,033 次观看 • 7 个月前

Elon Musk: We're currently harnessing less than 1% of the Sun's energy available on Earth. “One way to look at civilization is progress on the Kardashev scale. Kardashev scale 1 means you've harnessed all the power of a planet. I think we've probably harnessed less than 1% of the power of Earth. Kardashev scale 2 is you've harnessed all the power of your sun. The Sun is overwhelmingly the largest source of energy in the solar system. Everything else maybe amounts to about a trillionth of the energy in the solar system, compared to the Sun. So, it rounds up to 100%. That's how much of the energy in the future will be solar, when you view things from a Kardashev standpoint.” Future Investment Initiative Conference, October 29, 2024
0:39

Elon Musk: We're currently harnessing less than 1% of the Sun's energy available on Earth. “One way to look at civilization is progress on the Kardashev scale. Kardashev scale 1 means you've harnessed all the power of a planet. I think we've probably harnessed less than 1% of the power of Earth. Kardashev scale 2 is you've harnessed all the power of your sun. The Sun is overwhelmingly the largest source of energy in the solar system. Everything else maybe amounts to about a trillionth of the energy in the solar system, compared to the Sun. So, it rounds up to 100%. That's how much of the energy in the future will be solar, when you view things from a Kardashev standpoint.” Future Investment Initiative Conference, October 29, 2024

ELON CLIPS

1,067,433 次观看 • 1 年前

Elon Musk: The sun provides basically 100% of the energy in the solar system. “One way to look at civilization is progress on the Kardashev scale. Kardashev scale 1 means you've harnessed all the power of a planet. I think we've probably harnessed less than 1% of the power of Earth. Kardashev scale 2 is you've harnessed all the power of your sun. The sun is overwhelmingly the largest source of energy in the solar system. Everything else maybe amounts to about a trillionth of the energy in the solar system, compared to the sun. So, it rounds up to 100%. That's how much of the energy in the future will be solar, when you view things from a Kardashev standpoint.” Future Investment Initiative Conference, October 29, 2024
0:39

Elon Musk: The sun provides basically 100% of the energy in the solar system. “One way to look at civilization is progress on the Kardashev scale. Kardashev scale 1 means you've harnessed all the power of a planet. I think we've probably harnessed less than 1% of the power of Earth. Kardashev scale 2 is you've harnessed all the power of your sun. The sun is overwhelmingly the largest source of energy in the solar system. Everything else maybe amounts to about a trillionth of the energy in the solar system, compared to the sun. So, it rounds up to 100%. That's how much of the energy in the future will be solar, when you view things from a Kardashev standpoint.” Future Investment Initiative Conference, October 29, 2024

ELON CLIPS

1,693,456 次观看 • 1 年前

🇺🇸 Elon: "Scaling civilization means to scale power in space." He ties it to building massive chip output, accelerating factories, and increasing power generation to support future AI demand. The idea: more energy → more compute → faster innovation → repeat at scale. Source: Elon Musk Tesla
1:23

🇺🇸 Elon: "Scaling civilization means to scale power in space." He ties it to building massive chip output, accelerating factories, and increasing power generation to support future AI demand. The idea: more energy → more compute → faster innovation → repeat at scale. Source: Elon Musk Tesla

Mario Nawfal

207,005 次观看 • 3 个月前

ELON: ALMOST ALL THE ENERGY THAT WE'LL GET IS GOING TO COME FROM THE SUN "One way to look at civilization is its progress on the Kardashev scale. It's not clear to me that we're above 1% on the Kardashev scale 1. Kardashev scale 1 means you've harnessed all the power of a planet."
0:52

ELON: ALMOST ALL THE ENERGY THAT WE'LL GET IS GOING TO COME FROM THE SUN "One way to look at civilization is its progress on the Kardashev scale. It's not clear to me that we're above 1% on the Kardashev scale 1. Kardashev scale 1 means you've harnessed all the power of a planet."

Mario Nawfal

242,868 次观看 • 1 年前

Elon Musk says one millionth of the Sun's energy is 100,000X Earth's economy. Yes you read that right. For a century, every advance had run on a tiny fraction of the Sun's output. Oil. Coal. Solar. Natural gas. Combined, they powered everything every human had ever built. The total: about half a billionth of what hit the planet each day. "Earth only receives about half a billionth of the Sun's energy." Then Musk pulled up the Kardashev scale: "The Sun is essentially all the energy." He named the framework: **the Kardashev scale**. A Soviet astronomer's idea from 1964, repurposed for AI scaling. Musk, who needed a terawatt a year, knew civilization ran on a rounding error. A Kardashev Type I civilization harnesses all the energy that reaches its home planet, a Type II harnesses the full output of its star, and Earth in 2026 sat at neither. Earth was nowhere close to Type I. Not 1%. Not 0.1%. Not 0.001%. "Let's say you wanted to harness a millionth of the sun's energy, which sounds pretty small." "That would be about, call it roughly, 100,000x more electricity than we currently generate on Earth for all of civilization." A million times Earth's economy. From one millionth of the Sun. Take a billionth and you still have a thousand-Earth economy. After Musk did the math, modular nuclear reactors looked like rounding errors. Musk, on what scale required: "Obviously, the only way to scale is to go to space with solar." P.S. Pull the thread on any story like this and you'll find the hidden incentive at the other end. As Munger said: "Show me the incentive and I'll show you the outcome." So I wrote a short book on how to spot them and design your own. Comment "INCENTIVES" and I'll send you the details. If you're new here, GeniusThinking is a gallery for the greatest minds in economics, psychology, and history. Follow along for more similar content. — Elon Musk ( Elon Musk ), CEO of Tesla and SpaceX, on Dwarkesh Patel's ( Dwarkesh Patel ) podcast
1:03

Elon Musk says one millionth of the Sun's energy is 100,000X Earth's economy. Yes you read that right. For a century, every advance had run on a tiny fraction of the Sun's output. Oil. Coal. Solar. Natural gas. Combined, they powered everything every human had ever built. The total: about half a billionth of what hit the planet each day. "Earth only receives about half a billionth of the Sun's energy." Then Musk pulled up the Kardashev scale: "The Sun is essentially all the energy." He named the framework: **the Kardashev scale**. A Soviet astronomer's idea from 1964, repurposed for AI scaling. Musk, who needed a terawatt a year, knew civilization ran on a rounding error. A Kardashev Type I civilization harnesses all the energy that reaches its home planet, a Type II harnesses the full output of its star, and Earth in 2026 sat at neither. Earth was nowhere close to Type I. Not 1%. Not 0.1%. Not 0.001%. "Let's say you wanted to harness a millionth of the sun's energy, which sounds pretty small." "That would be about, call it roughly, 100,000x more electricity than we currently generate on Earth for all of civilization." A million times Earth's economy. From one millionth of the Sun. Take a billionth and you still have a thousand-Earth economy. After Musk did the math, modular nuclear reactors looked like rounding errors. Musk, on what scale required: "Obviously, the only way to scale is to go to space with solar." P.S. Pull the thread on any story like this and you'll find the hidden incentive at the other end. As Munger said: "Show me the incentive and I'll show you the outcome." So I wrote a short book on how to spot them and design your own. Comment "INCENTIVES" and I'll send you the details. If you're new here, GeniusThinking is a gallery for the greatest minds in economics, psychology, and history. Follow along for more similar content. — Elon Musk ( Elon Musk ), CEO of Tesla and SpaceX, on Dwarkesh Patel's ( Dwarkesh Patel ) podcast

GeniusThinking

29,177 次观看 • 1 个月前

ELON MUSK - “Our progress toward a Kardashev Type II civilization… a reasonable goal would be to try to get to a millionth of the Sun’s energy.”
1:36

ELON MUSK - “Our progress toward a Kardashev Type II civilization… a reasonable goal would be to try to get to a millionth of the Sun’s energy.”

Tesla Owners Silicon Valley

645,828 次观看 • 5 个月前

🇺🇸 Starship isn’t just a rocket… to Elon, it’s essential for scaling civilization by enabling massive transport of materials, satellites, and infrastructure to space. Because deploying compute and energy systems off-world, makes large-scale space-based operations actually feasible. The pitch: without Starship’s payload capacity and cost reduction, the whole “scale everything” plan hits a ceiling. Why? It’s what makes scaling beyond Earth actually possible. Source: Elon Musk, Tesla
0:25

🇺🇸 Starship isn’t just a rocket… to Elon, it’s essential for scaling civilization by enabling massive transport of materials, satellites, and infrastructure to space. Because deploying compute and energy systems off-world, makes large-scale space-based operations actually feasible. The pitch: without Starship’s payload capacity and cost reduction, the whole “scale everything” plan hits a ceiling. Why? It’s what makes scaling beyond Earth actually possible. Source: Elon Musk, Tesla

Mario Nawfal

176,400 次观看 • 3 个月前

🚨ELON MUSK: "The biggest source of energy is The Sun. One of the ways you can think about the progress of a civilization is the Kardashev scale. You're Kardashev level 1 if you harness the power of a planet, 2 if you harness the power of a solar system, or 3 if you harness the power of a galaxy. When you think in terms of the Kardashev scale, it becomes obvious that the Sun is the most overwhelming source of energy, and everything else is tiny potatoes. The sun is a big potato. A humungous potato." 🥔☀️
1:22

🚨ELON MUSK: "The biggest source of energy is The Sun. One of the ways you can think about the progress of a civilization is the Kardashev scale. You're Kardashev level 1 if you harness the power of a planet, 2 if you harness the power of a solar system, or 3 if you harness the power of a galaxy. When you think in terms of the Kardashev scale, it becomes obvious that the Sun is the most overwhelming source of energy, and everything else is tiny potatoes. The sun is a big potato. A humungous potato." 🥔☀️

Autism Capital 🧩

17,687,192 次观看 • 1 年前

“One of the ways you can think about the progress of a civilization is the Kardashev scale. When you think in terms of the Kardashev scale, it becomes obvious that the Sun is the most overwhelming source of energy.” — Elon Musk
1:22

“One of the ways you can think about the progress of a civilization is the Kardashev scale. When you think in terms of the Kardashev scale, it becomes obvious that the Sun is the most overwhelming source of energy.” — Elon Musk

Dima Zeniuk

1,105,167 次观看 • 1 年前

"One way to look at the progress of civilization is percentage completion Kardashev so if you're in a Kardashev scale I, you've harnessed all the energy of a planet. In my opinion, we've only harnessed maybe 2% of Earth's energy. So we've got a long way to go." 一 Elon Musk
0:47

"One way to look at the progress of civilization is percentage completion Kardashev so if you're in a Kardashev scale I, you've harnessed all the energy of a planet. In my opinion, we've only harnessed maybe 2% of Earth's energy. So we've got a long way to go." 一 Elon Musk

DogeDesigner

29,612 次观看 • 1 年前