At a news conference in Paris, Obama said that climate change is probably the hardest kind of problem for politicians to solve, yet despite the hurdles, he's optimistic.
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A warming climate is likely to disrupt global food production, which has Big Food companies worried. Some, like Mars, are becoming increasingly vocal advocates for action on greenhouse gas emissions.
It took about 30 teams of scientists using supercomputers to churn through mountains of data to see patterns aligning of what will happen decades and centuries from now.
How can climate scientists be so sure about what will happen decades and centuries from now? About 30 teams using supercomputers to churn through mountains of data see patterns aligning.
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The Kyoto Protocol of 1997 didn't slow down the gradual warming of the planet. Now governments meeting for a two-week summit are trying an a la carte approach.
The 1997 Kyoto treaty set targets for cutting greenhouse gas emissions that many nations didn't meet. This time, stakes are higher and all countries will be asked to set and meet their own limits.
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