Bring up the topic of global warming, and you may find yourself in the middle of a "heated" conversation. Why is this considered such a controversial topic? Follow this link to the National Geographic web site to get reliable, factual information on this topic.
http://environment.nationalgeographic.com/environment/global-warming/#
1. What are two things you learned from this site?
2. What are two questions that you still have about global warming?
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