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Government projects, on the international scale.

Tax incentives. It's how we encourage a lot of good samaritan behavior.

Offer tax deductions for trees and watch forests pop up everywhere.

Government could subsidize the price of lumber. You want it to be a more economical alternative than farmland. Then leave things like efficient use of water, tree density, and type of fast growing tree to the market, those are probably already optimized.

I'm wondering about crowdfunding and putting the land into a national land bank.