Bill Gates declared it's 'complete nonsense' to think planting trees will solve climate change. 'Pro-tree' Salesforce CEO Marc Benioff accused him of going on a 'tirade.'

• Bill Gates recently said that planting trees to address climate change is a "less proven" approach.
• Salesforce CEO Marc Benioff took offense, saying Gates went on an unnecessary "tirade."
• Benioff himself is an advocate for planting trees and has put millions toward reforestation.

Bill Gates and Marc Benioff apparently have very different ideas about how to address climate change — and how to spend their philanthropic dollars.