Global reforestation is almost entirely the result of households switching from wood to coal in the 20th century.
This is ludicrously off-base for fossil fuels, even if we're only talking about local pollutants from the plants themselves, nevermind things like Exxon Valdez or the pipelines or the act of mining. Nuclear seems likely, though as the other commenter noted it's not a magic bullet either.
> Global reforestation is almost entirely the result of households switching from wood to coal in the 20th century.
This is a European phenomena mostly, and is a result of urbanization mostly.
Currently: 64% coal, lots of nat gas, ~20 renewables.
The future plan is to use a lot more industrial waste heat. Burning garbage is done and planned, but nowhere near a major factor. Not to mention that the garbage would also need to come from something: plastics from oil, wood from trees etc.