Forests burn, glaciers melt and one million species face extinction. Can we humans save the planet from ourselves? Here, Sir David Attenborough speaks to us about the climate crisis and his hopes for the future. His words begin our new focus on Sustainable Earth, looking at how we transition to a carbon zero future, protect the planet's resources, reduce waste and build resilience.

Research reveals rifts within global movement – from economic approaches to protected areas – while confirming support for aims underpinning it.