"Climate change is directly related to the growth of terrorism," Sanders said at the Democratic debate on Saturday, citing CIA intelligence.
Lindsey Graham and George Pataki have the strongest records on climate change, but they're not doing well in the polls.
Watch George Pataki and Lindsey Graham say CO2 is heating up the planet. Too bad they were at the second-tier debate instead of the first.
Hurricane Patricia just became the strongest hurricane ever recorded in the Western hemisphere.
The problem with universally condemning energy subsidies is that they're not all the same.
The GOP presidential hopeful has been a vocal supporter of the ethanol industry -- except when he bashes it.
Scientist Ken Caldeira explains.
Climate change could make deadly diseases like rotavirus even worse.
Instead of getting stuck on annual heat records, we need to focus on the trend of global warming.