[Script Info]
Title: 
[Events]
Format: Layer, Start, End, Style, Name, MarginL, MarginR, MarginV, Effect, Text
Dialogue: 0,0:00:00.63,0:00:07.10,Default,,0000,0000,0000,,Taking a deep breath is one of the most simple ways to connect with our own bodies,
Dialogue: 0,0:00:07.10,0:00:13.46,Default,,0000,0000,0000,,But taking a deep breath was not something that was possible on this earth three billion years ago.
Dialogue: 0,0:00:13.46,0:00:20.48,Default,,0000,0000,0000,,Before the ozone layer existed, earth was not really\Nable to sustain complex, multicellular life.
Dialogue: 0,0:00:20.48,0:00:24.50,Default,,0000,0000,0000,,The composition of the atmosphere of the earth\Nhad almost no oxygen at all.
Dialogue: 0,0:00:24.50,0:00:28.00,Default,,0000,0000,0000,,We actually had a huge amount of carbon dioxide.
Dialogue: 0,0:00:28.00,0:00:34.37,Default,,0000,0000,0000,,And the net effect was a almost (un)inhabitable planet.
Dialogue: 0,0:00:34.37,0:00:40.55,Default,,0000,0000,0000,,The only organisms that could exist that time\Nwere single-celled organisms.
Dialogue: 0,0:00:40.55,0:00:46.73,Default,,0000,0000,0000,,Luckily for us, one of those organisms that was alive\Nat this time was something called a cyanobacteria.
Dialogue: 0,0:00:46.73,0:00:54.00,Default,,0000,0000,0000,,And this organism has the special trick that\Nwe call “photosynthesis,”
Dialogue: 0,0:00:55.05,0:01:02.26,Default,,0000,0000,0000,,the ability to go take energy from the sun and transform carbon dioxide into oxygen.
Dialogue: 0,0:01:02.26,0:01:06.92,Default,,0000,0000,0000,,And over the course of billions of years,\Nlittle by little these bacteria spread across the planet
Dialogue: 0,0:01:06.92,0:01:13.58,Default,,0000,0000,0000,,and converted all that carbon dioxide\Nin the air into the oxygen that we now have.
Dialogue: 0,0:01:13.58,0:01:20.00,Default,,0000,0000,0000,,And it was a very slow process. First, they\Nhad to saturate the seas,
Dialogue: 0,0:01:20.00,0:01:25.00,Default,,0000,0000,0000,,then they had to saturate the oxygen that the earth would absorb,
Dialogue: 0,0:01:25.00,0:01:31.00,Default,,0000,0000,0000,,and only then, finally, could oxygen begin to build up in the atmosphere.
Dialogue: 0,0:01:31.00,0:01:37.00,Default,,0000,0000,0000,,And about 600 million years ago, something really amazing happens.
Dialogue: 0,0:01:37.00,0:01:42.00,Default,,0000,0000,0000,,The ozone layer forms from the oxygen that has been released in the atmosphere.
Dialogue: 0,0:01:42.00,0:01:50.00,Default,,0000,0000,0000,,And shortly after the ozone layer came into place, the earth was able to sustain complex, multi-cellular life.
Dialogue: 0,0:01:50.00,0:01:54.00,Default,,0000,0000,0000,,There was a Cambrian explosion of life in the seas.
Dialogue: 0,0:01:54.00,0:01:58.00,Default,,0000,0000,0000,,And the first plants got onto land.
Dialogue: 0,0:01:58.00,0:02:02.00,Default,,0000,0000,0000,,In fact, there was actually no life on land ahead of that.
Dialogue: 0,0:02:02.00,0:02:06.83,Default,,0000,0000,0000,,Nothing that you are familiar\Nwith today could exist without the contributions
Dialogue: 0,0:02:06.83,0:02:14.00,Default,,0000,0000,0000,,of these tiny organisms over those billions\Nof years.
Dialogue: 0,0:02:14.00,0:02:18.73,Default,,0000,0000,0000,,Imagine you were one of these little organisms two billion years ago.
Dialogue: 0,0:02:18.73,0:02:20.47,Default,,0000,0000,0000,,You might be born.
Dialogue: 0,0:02:20.47,0:02:21.77,Default,,0000,0000,0000,,You live a couple weeks.
Dialogue: 0,0:02:21.77,0:02:23.00,Default,,0000,0000,0000,,You die.
Dialogue: 0,0:02:23.00,0:02:25.80,Default,,0000,0000,0000,,And you kind of feel like, well, nothing really changed.
Dialogue: 0,0:02:25.80,0:02:33.00,Default,,0000,0000,0000,,I mean, I had no purpose in this life. The world I came to is exactly the same as the world that I left.
Dialogue: 0,0:02:33.00,0:02:37.60,Default,,0000,0000,0000,,But what you wouldn’t\Nhave understood is that every breath
Dialogue: 0,0:02:37.60,0:02:44.56,Default,,0000,0000,0000,,that you took contributed to the possibility of countless lives after you –
Dialogue: 0,0:02:44.56,0:02:47.66,Default,,0000,0000,0000,,lives that you would never see,
Dialogue: 0,0:02:47.66,0:02:53.00,Default,,0000,0000,0000,,lives that we are all a part of today.
Dialogue: 0,0:02:53.00,0:02:56.50,Default,,0000,0000,0000,,And it’s worth thinking that maybe the meaning of our lives
Dialogue: 0,0:02:56.50,0:02:59.90,Default,,0000,0000,0000,,are actually not even within the scope of our understanding.
Dialogue: 0,0:02:59.90,0:03:02.74,Default,,0000,0000,0000,,Because it’s\Ntrue of every one of these organisms,
Dialogue: 0,0:03:02.74,0:03:07.00,Default,,0000,0000,0000,,and it may also be true of us.
Dialogue: 0,0:03:07.00,0:03:11.00,Default,,0000,0000,0000,,And if it’s a possible thing for cyanobacteria to completely transform
Dialogue: 0,0:03:11.00,0:03:14.00,Default,,0000,0000,0000,,the physical environment\Nof our planet,
Dialogue: 0,0:03:14.00,0:03:20.50,Default,,0000,0000,0000,,it is absolutely a possible thing for us to do the same thing.
Dialogue: 0,0:03:20.50,0:03:26.48,Default,,0000,0000,0000,,We’ve been given this amazing gift of consciousness.
Dialogue: 0,0:03:26.48,0:03:33.00,Default,,0000,0000,0000,,And because of this gift, we have the ability\Nto deeply understand our connectedness.
Dialogue: 0,0:03:33.00,0:03:37.22,Default,,0000,0000,0000,,And because we can deeply understand our connectedness,
Dialogue: 0,0:03:37.22,0:03:43.90,Default,,0000,0000,0000,,we’re the ones that have the decision on how we’re going to go use that knowledge
Dialogue: 0,0:03:43.99,0:03:52.00,Default,,0000,0000,0000,,to build our societies and to shape our lives.