they are more straight forward. we know trees absorb carbon dioxide, which is one of the gases that causes climate change. and there are lots of plans to plant more of them. this was donald trump back in 2020. today, i am pleased to announce the united states willjoin 1 trillion trees initiative, being launched here at the world economic forum. 1 trillion trees. and if that s the us, we ve seen other big pledges. ethiopia plans to plant 20 billion trees by 2022. china says it will plant 36,000 square kilometres of new forest every year by 2025. and pakistan wants to plant ten billion trees by 2023. but is tree planting really this rare thing, a good idea without a catch? to many, it s not that straight forward. this is dr bonnie waring. we cannot plant our way out of the carbon crisis with business as usual emission scenarios.