David Attenborough has addressed world leaders at the G7 Summit in Cornwall, asking them to act together to tackle the climate emergency. 

He reminded delegates, including Joe Biden, Angela Merkel and Emmanuel Macron, that a Covid-19 vaccine was developed with global scientific collaboration and urged them to work together with the same speed to tackle climate change. 

The natural historian and broadcaster told leaders that implementing the action required to tackle the emergency needs the support of politicians.

He said: "It is now as much of a political and communications challenge, as it is a scientific and technological one."

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