Climate Change & Global Warming

Global sea ice thumbnail

NASA ice expert Claire Parkinson does the math on global sea ice and confirms that small gains around Antarctica do not cancel out large losses in the Arctic.

Thursday, October 1, 2009

  • Climate scientists discuss what they know about global climate change today, and how they know it.

  • Climate scientists explain why they’re sure the primary cause of global climate change today is increasing human emission of greenhouse gases — mainly carbon dioxide.
     

  • Carbon dioxide is everywhere: in the air, rising from cracks in the ocean floor, and in your soda can. Now it's showing up in the news! Find out why carbon dioxide is such a hot topic, and why it's going to be around for a long, long time.