Climate scientist James Hansen is retiring from NASA this week to devote himself to the fight against global warming.<img src="http://feeds.feedburner.com/~r/DiscoveryNews-Top-Stories/~4/7kv7rVUC3Po" height="1" width="1"/>
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Climate scientist James Hansen is retiring from NASA this week to devote himself to the fight against global warming.<img src="http://feeds.feedburner.com/~r/DiscoveryNews-Top-Stories/~4/7kv7rVUC3Po" height="1" width="1"/>