Since 2020, Salesforce CEO and co-founder Marc Benioff has been on a mission to plant and preserve one trillion trees. The idea behind his initiative, 1t.org, is simple: A tree is good at taking carbon dioxide out of the environment. And more trees mean more greenhouse gas removal.

Four years, millions of dollars, and dozens of pledges from non-profits, NGOs, national governments, and private companies later – how close is Benioff to one trillion trees? Today, host Sarah Holder talks to Bloomberg wealth reporter Sophie Alexander about why a billionaire decided to go all in on reforestation, why the private sector followed, and why the initiative is lagging behind. 

Read more: A Billionaire Wanted to Save 1 Trillion Trees by 2030. It’s Not Going Great.