[Script Info]
Title: 
[Events]
Format: Layer, Start, End, Style, Name, MarginL, MarginR, MarginV, Effect, Text
Dialogue: 0,0:00:06.80,0:00:09.06,Default,,0000,0000,0000,,As the sun's rays reach \Nthe Earth's surface
Dialogue: 0,0:00:09.32,0:00:11.59,Default,,0000,0000,0000,,some are absorbed and re-emitted as heat
Dialogue: 0,0:00:11.91,0:00:15.08,Default,,0000,0000,0000,,greenhouse gases such as water \Nvapor and carbon dioxide
Dialogue: 0,0:00:15.30,0:00:17.83,Default,,0000,0000,0000,,absorb and re-radiate some of this heat
Dialogue: 0,0:00:18.42,0:00:21.66,Default,,0000,0000,0000,,increased amounts of greenhouse gases \Nin the atmosphere mean more
Dialogue: 0,0:00:21.66,0:00:22.50,Default,,0000,0000,0000,,heat is trapped
Dialogue: 0,0:00:22.95,0:00:23.78,Default,,0000,0000,0000,,warming the Earth
Dialogue: 0,0:00:24.51,0:00:25.33,Default,,0000,0000,0000,,human activities
Dialogue: 0,0:00:25.60,0:00:28.49,Default,,0000,0000,0000,,especially the burning of fossil \Nfuels have increased
Dialogue: 0,0:00:28.60,0:00:32.16,Default,,0000,0000,0000,,concentrations of atmospheric \Ncarbon dioxide by 40%
Dialogue: 0,0:00:32.56,0:00:33.94,Default,,0000,0000,0000,,mainly since 1900
Dialogue: 0,0:00:34.54,0:00:38.84,Default,,0000,0000,0000,,global average surface temperature \Nhas increased by 0.8° C over that time
Dialogue: 0,0:00:40.30,0:00:42.77,Default,,0000,0000,0000,,Other changes to the climate \Nin recent decades,
Dialogue: 0,0:00:42.77,0:00:45.05,Default,,0000,0000,0000,,can be seen in the warming of the oceans.
Dialogue: 0,0:00:45.05,0:00:46.23,Default,,0000,0000,0000,,A rise in sea level
Dialogue: 0,0:00:47.01,0:00:49.73,Default,,0000,0000,0000,,decreasing snow and ice cover \Nin the northern hemisphere
Dialogue: 0,0:00:50.40,0:00:52.52,Default,,0000,0000,0000,,and a decline in sea ice in the Arctic.
Dialogue: 0,0:00:54.62,0:00:58.48,Default,,0000,0000,0000,,If emissions continue unchecked \Nthen further warming of 2.6 to 4.8° C
Dialogue: 0,0:00:59.61,0:01:02.88,Default,,0000,0000,0000,,would be expected by \Nthe end of the century.
Dialogue: 0,0:01:02.88,0:01:04.09,Default,,0000,0000,0000,,Even at the low end.
Dialogue: 0,0:01:04.09,0:01:07.00,Default,,0000,0000,0000,,This would have serious implications \Nfor human societies
Dialogue: 0,0:01:07.24,0:01:08.24,Default,,0000,0000,0000,,and the natural world.
Dialogue: 0,0:01:12.47,0:01:15.14,Default,,0000,0000,0000,,For more information about climate \Nchange from leading science academies,
Dialogue: 0,0:01:16.03,0:01:16.67,Default,,0000,0000,0000,,please visit
Dialogue: 0,0:01:16.92,0:01:19.16,Default,,0000,0000,0000,,royalsociety.org/climatechange
Dialogue: 0,0:01:20.16,0:01:23.07,Default,,0000,0000,0000,,or nas-sites.org/americasclimatechoices