Pretend, if you can, that you've never heard about the idea of global warming before. There are really only two things that determine the Earth's temperature, or the temperature of any object that's heated by an external source. It cannot be proven that human activity is the cause of global warming, of course. But based on what we know about planetary science, Earth’s atmosphere, human activity and the warming we’re observing, it seems like a very good one. ARTICLE CONTINUES AFTER ADVERTISEMENTThe Earth is warming, and humans are the cause.

Source: Forbes January 02, 2019 15:00 UTC