Chris Packham presents a special, one-off documentary about the crucial role trees have to play in combating climate change. And with the help of viewers, we raised funds to get thousands more of them in the ground.

Joined by presenters John Humphrys, Clare Nasir, Martin Hughes Games and JB Gill, plus experts from Woodland Trust, Chris explores the science of trees, the impacts of deforestation both worldwide and here in the UK, and how trees can help lock up carbon, fight flooding, and make landscapes more resilient.

Dame Judi Dench, one of Britain’s most respected film, stage and television actresses, and one of the Woodland Trust's ambassadors, also got behind this partnership.