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Here is video about effects of climate change in Alaska and measuring CO2 levels
from Discovery Channel

http://dsc.discovery.com/videos/earth-s ... laska.html
If climate change is evident anywhere in the United States, it's in Alaska. Kasey-Dee Gardner spent a week in the arctic state to see for herself what's happening.

http://dsc.discovery.com/videos/news-mo ... hange.html
News: Monitoring Climate Change
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How do we know for sure that our climate is changing? James Williams takes a look at some of the instruments used to monitor the atmosphere.