Something about the earth’s warming surface temperature.
Check it out:

Calls from environmentalists and lawmakers to cut carbon dioxide emissions to fight global warming would do nothing to stop global temperatures from rising, according to American and British climate scientists.

In fact, completely stopping all man-made carbon emissions would do nothing to stop the Earth from warming.

The U.S. National Academy of Sciences and the UK’s Royal Society have jointly put out a publication to lay out the knowns and unknowns of global warming science. The publication says that global temperatures are rising due to man-made greenhouse gas emissions, primarily from the burning of fossil fuels.