View of the bed of Jacarei river dam, in Piracaia, during a drought affecting Sao Paulo state, Brazil on November 19, 2014. The Jacarei river dam is part of the Sao Paulo's Cantareira system of dams, which supplies water to 45% of the metropolitan region of Sao Paulo --20 million people-- and is now at historic low. AFP PHOTO / NELSON ALMEIDA (Photo credit should read NELSON ALMEIDA/AFP/Getty Images)
Video Ad Feedback
Where does '97% consensus' on climate change come from?
CNN meteorologist Chad Myers answers a viewer question as to where the 97% consensus comes from when talking about man's impact on climate change.
02:55 - Source: CNN
2 degrees 12 videos
View of the bed of Jacarei river dam, in Piracaia, during a drought affecting Sao Paulo state, Brazil on November 19, 2014. The Jacarei river dam is part of the Sao Paulo's Cantareira system of dams, which supplies water to 45% of the metropolitan region of Sao Paulo --20 million people-- and is now at historic low. AFP PHOTO / NELSON ALMEIDA (Photo credit should read NELSON ALMEIDA/AFP/Getty Images)
Video Ad Feedback
Where does '97% consensus' on climate change come from?
02:55
Now playing
- Source: CNN
two degrees climate change debate urgency_00002421.jpg
Video Ad Feedback
Is there a sense of urgency regarding climate change?
04:30
Now playing
- Source: CNN
two degrees sea change in maine sebastian pkg_00005709.jpg
Video Ad Feedback
Shortage of cod may be linked to climate change
02:57
Now playing
- Source: CNN
This photo taken on March 3, 2014 shows a resident surrounded by the on-rushing high tide energized by a storm surge that damaged a number of homes across Majuro. It was the third inundation of the Marshall's capital atoll in the past 12 months. The Marshall Islands has put climate change at the top of its political and diplomatic agenda and officials saw the recently held Cartagena Dialogue as an opportunity to gather momentum. AFP PHOTO / Karl Fellenius (Photo credit should read Karl Fellenius/AFP/Getty Images)
Video Ad Feedback
When climate change wipes your country off the map
05:22
Now playing
- Source: CNN
cop21 messages
Video Ad Feedback
Your messages for COP21 leaders
01:48
Now playing
- Source: CNN
long 2 degrees congo conservation damon pkg_00001323.jpg
Video Ad Feedback
How to save mountain gorillas in the Congo
06:37
Now playing
- Source: CNN
Two Degrees Card graph
Video Ad Feedback
2 degrees Celsius: A critical number for climate change
01:16
Now playing
- Source: CNN
For two degrees, Woodward, Oklahoma story
Video Ad Feedback
Opinion: Common ground with climate skeptics
03:23
Now playing
- Source: CNN
climate change coast cities ny sebastian pkg_00011504.jpg
Video Ad Feedback
Two degrees, climate change, and NY rebuilding efforts
02:29
Now playing
- Source: CNN
two degrees poem 3
Video Ad Feedback
Marshall Islands can't survive 2 degrees of warming
03:10
Now playing
- Source: CNN
coal climate change two degrees sutter orig mg_00000302.jpg
Video Ad Feedback
The town that stood up to coal
03:53
Now playing
- Source: CNN
two degrees ikea foundation curnow intv_00022629.jpg
Video Ad Feedback
IKEA invests in climate change action plan
03:28
Now playing
- Source: CNN