Today tens of thousands of people across 150 countries are marching to demand action to combat climate change, ahead of a UN summit next week. In Britain, the People's Climate March is marching in Edinburgh and London.
But while thousands take to the streets, a poll has revealed that half the country doesn't think it's a problem.
According to YouGov just six per cent of people in the UK think climate change is the most serious problem the world faces.
More people were concerned by terrorism and poverty.