[Script Info]
Title: 
[Events]
Format: Layer, Start, End, Style, Name, MarginL, MarginR, MarginV, Effect, Text
Dialogue: 0,0:00:02.78,0:00:04.61,Default,,0000,0000,0000,,Why is the world warming up?
Dialogue: 0,0:00:06.82,0:00:10.09,Default,,0000,0000,0000,,Let's think of Earth\Nfor just a moment as a greenhouse.
Dialogue: 0,0:00:10.93,0:00:15.59,Default,,0000,0000,0000,,Every second, a huge amount of energy\Nsmashes into our greenhouse.
Dialogue: 0,0:00:16.90,0:00:20.47,Default,,0000,0000,0000,,Our atmosphere, the glass roof and walls,
Dialogue: 0,0:00:20.49,0:00:22.51,Default,,0000,0000,0000,,reflects some of that energy,
Dialogue: 0,0:00:22.54,0:00:26.07,Default,,0000,0000,0000,,but most of it passes right through\Nand heats everything up.
Dialogue: 0,0:00:27.34,0:00:29.86,Default,,0000,0000,0000,,Much of that heat\Nused to escape back into space,
Dialogue: 0,0:00:29.88,0:00:32.56,Default,,0000,0000,0000,,keeping us at a stable, warm temperature.
Dialogue: 0,0:00:33.61,0:00:35.24,Default,,0000,0000,0000,,But then something changed.
Dialogue: 0,0:00:36.11,0:00:41.36,Default,,0000,0000,0000,,Humans began to spew enough carbon dioxide\Nto fill billions of greenhouses each day.
Dialogue: 0,0:00:42.90,0:00:45.52,Default,,0000,0000,0000,,What does all that greenhouse gas do?
Dialogue: 0,0:00:45.54,0:00:48.42,Default,,0000,0000,0000,,It makes the glass\Nof our greenhouse thicker.
Dialogue: 0,0:00:48.76,0:00:52.42,Default,,0000,0000,0000,,Thicker glass means heat escapes\Ninto space much more slowly.
Dialogue: 0,0:00:52.44,0:00:54.22,Default,,0000,0000,0000,,And don't forget, energy from the sun
Dialogue: 0,0:00:54.24,0:00:57.25,Default,,0000,0000,0000,,is still streaming in\Njust as quickly as before.
Dialogue: 0,0:00:57.27,0:01:01.03,Default,,0000,0000,0000,,The result is a planet with temperatures\Ntoo hot for our liking
Dialogue: 0,0:01:01.05,0:01:03.08,Default,,0000,0000,0000,,and, eventually...
Dialogue: 0,0:01:03.61,0:01:04.78,Default,,0000,0000,0000,,living.
Dialogue: 0,0:01:08.64,0:01:10.40,Default,,0000,0000,0000,,[Countdown
Dialogue: 0,0:01:10.43,0:01:12.96,Default,,0000,0000,0000,,Take action on climate change\Nat Countdown.ted.com]