Climate change is set to cause major changes across the world: sea levels will rise, food production could fall and species may be driven to extinction.
The UN has warned that the world needs to limit climate change to below 1.5C above pre-industrial levels. But scientists say that keeping to the 1.5C target will require "rapid, far-reaching and unprecedented changes" in all aspects of society.
So how warm has the world got and what can we do about it?
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