The single act that would have the most benefit to the environment would be replacing the current tax code which encourages stupid, wasteful consumption with a tax on consumption like the national retail sales tax.
The national retail sales tax makes American workers more competitive with foreign workers because the stuff on WalMarts shelves made by American workers is taxed at the same rate as the stuff on WalMarts shelves made by foreign workers.
Actually it's better.American corporations and their employees pay NO Taxes under the Fair Tax,I mean NONE.No SS,NO FICA,No Medicare taxes.Which means products made here will be cheaper than stuff made oversea.