An important agreement has been made by the world's politicians to make the planet a safer place for future generations.
At a meeting in Marrakech, Morocco countries agreed by how much they would cut the amount of harmful gases they produce.
The decision to reduce the amount of gases was made in 1997 and is called the Kyoto agreement.
America refuse to take part
A big problem is that America refused to take part in the agreement, and they produce more harmful gases than any other country in the world.
President George Bush decided not get involved, because he said it would be too expensive for American businesses to take part.
Now the countries have agreed by how much they are going to cut their emissions, they need to work out how they can do it.