Right now politicians from around the world are gathered together for a very important meeting in Paris - to try to make some big decisions about climate change.
Here in the UK, Bristol is European Green Capital 2015, and the city is trying to do as much as possible to help try to save the environment.
Schools there are having special lessons about climate change, its effects and how they can do their bit to tackle it.
They have 'green teams' that take charge of recycling and turn off unused electrical equipment to save energy.
They gave Newsround their messages to world leaders going to the climate conference in Paris in France.