The Earth is getting warmer and scientists know why:

Greenhouse gas pollution in the atmosphere is rising, which traps more heat on the planet. The main cause of this excess pollution is carbon dioxide (CO₂), which is emitted whenever people burn fossil fuels (such as coal and petroleum) for energy.

What's really warming the Earth?

It’s us. (Yes, really.) Natural forces such as solar activity, orbital changes, and volcanoes aren’t strong enough to account for the warming we’ve seen in recent decades. Only when we consider the increase in greenhouse gases emissions are we able to explain the observed rise in global temperatures.