According to the International Energy Agency, at current emission rates, by 2040 the world will release all the carbon dioxide it can afford to if it wants to keep global warming to manageable levels.
Less than a week ago, Fox News guest Charles Krauthammer said that "if [President Obama] gets an agreement with China, which he won't, but that's the one area it would be historic." Since that's become a reality, Fox News wasn't sure what to say Wednesday morning.
The new U.S.-China climate deal greatly increases the chance of a global agreement in 2015 that could put the world on a path toward avoiding catastrophic warming. It also ensures that carbon-free energy will be the dominant source of new energy in the coming decades.
Much of the reaction thus far has come from politicians and advocates, but it is also important to note the reactions of the people who actually measure climate change and predict how it will impact humans in the future. What do they think about the deal?