Starting work on Planet Earth III is a daunting prospect. You ask yourself, are there really new places to travel to? Can we find new dramas to tell? Could we even film a species for the first time?

This special Earth Day episode of Planet Earth III is narrated by schoolchildren across the UK. Because you don’t have to be Sir David Attenborough to Become a Voice for Nature.

David Attenborough explores just how far climate change is altering our planet, from drought-stricken rainforest to declining polar bears, from flooded homes to bleached coral. He searches for the ...