00:00What if I told you Earth might actually regulate itself like a living organism?
00:04For billions of years, Earth has survived asteroid impacts,
00:08massive volcanic eruptions and dramatic climate changes.
00:12Even stranger, the Sun has become 25 to 30% brighter over Earth's history,
00:17yet our planet has remained capable of supporting life.
00:21So, how?
00:24Scientists have proposed an idea called the Gaia hypothesis.
00:28Earth's atmosphere, oceans, rocks and living organisms
00:32are all connected through countless feedback loops.
00:36Think about your body.
00:38When you're hot, you sweat.
00:40When you're cold, you shiver.
00:43Earth may have its own version of this, called planetary homeostasis.
00:47One famous example is Daisy World.
00:50Black daisies absorb sunlight and warm the planet,
00:53while white daisies reflect sunlight and cool it.
00:56Their simple competition can create a natural temperature-balancing effect
01:01without either one trying to save the planet.
01:04But here's the scary part.
01:05A self-regulating Earth doesn't necessarily mean a safe Earth for humans.
01:11Climate change is already triggering feedback loops like melting ice and thawing permafrost,
01:17which can cause even more warming.
01:19So, the real question isn't whether Earth will survive.
01:23It probably will.
01:24The question is, will humans still be part of the Earth that survives?
01:28Now you're in the sky with no arms.
01:28Our love is so leather.
01:28Back to the future.
01:28We've got a space space for humans.
