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 ...

Narrator: Further from the Sun, in the outer reaches of the solar system, we find the gas planets. Much larger than the rocky planets, these cosmic giants are accompanied by numerous moons.

We have the science. We now need the leadership—and the courage to change course. Carbon dioxide and other heat-trapping gases are the main drivers of global warming. While climate change cannot be ...