Independent: Leonardo DiCaprio has told leaders "the world is watching" as they sign an historic agreement to combat climate change.
The actor, who used his Oscar acceptance speech in February to highlight the seriousness of climate change, addressed world leaders at the UN headquarters in New York before they signed the Paris Agreement, a treaty which requires them to cut carbon emissions.
"Our planet cannot be saved unless we leave fossil fuels in the ground where they belong," DiCaprio said.
"After...