Reducing greenhouse gas emissions will play an important role in the fight to slow down climate change. Ruairi Brogan, who works for a wildlife charity, explains where greenhouse gases come from ...

President Donald Trump on his first day in office again withdrew the U.S. from a landmark global pact to fight climate change. So what is the Paris Agreement? And what happens to it now?

The warm Earth emits infrared radiation. Some gases absorb this radiation and re-emit it in all directions.