Complement the subsidy on trees to encourage carbon sequestration with a tax on arable land which could be potentially forested (reforested). When the land is actually forested, the tax and subsidy cancel out.
The tax can be straightforwardly assessed per unit area of land, multiplied by a factor for how well the land could grow trees.
Next, tax imports, e.g., imported agriculture, by how much trees could have been grown instead of the exported product. Trade treaties can remove such import tariffs if the other country has in place an equitable tax on non-forested land use.
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