More than 100 world leaders will sign up to a landmark multi-billion euro agreement to protect and restore the Earth's forests.
On the second day of the Cop26 climate summit in Glasgow - they'll commit to stop and reverse deforestation by 2030.
It's after Brazil yesterday pledged to crack down on illegal practices in the Amazon.
Meanwhile, the Taoiseach will outline Ireland's commitments to reducing carbon emissions when he addresses the summit later.
Micheal Martin is expected to commit 225 million a year up to 2025 to help poorer countries with climate change.
European Commission President Ursula von der Leyen says all leaders have to step up: