The biggest ever study on climate change is to confirm the world is definitely getting hotter and it's mainly our fault.
Experts are expected to warn the world could be 3 degrees warmer by the end of the century, damaging the planet.
This would have a devastating effect on weather and wildlife around the world, as ice caps melt and sea levels rise.
Experts say greenhouse gases we produce - like carbon dioxide - are mainly to blame for the temperature rises.
Lessons on saving energy
Eiffel Tower in darkness
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To help save the planet, the government want school children in England to have lessons about climate change.
The classes, which will start next year, will teach you how to save energy and recycle waste.
As part of a campaign to highlight the problem, the Eiffel Tower in Paris, France, switched its lights off for 15 minutes on Thursday.