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Matt I am a huge fan of your Global Greening content.

The ex CEO of reddit wrote a blog post recently about solving global warming by engineering the biome of Sahara desert back to forest.[1]

He says it must be done with solar panels (for water desalination, by far the main cost) and the cost is $3T - nearly entirely from solar panel costs.

My questions are: What are your thoughts on doing this, as a lukewarmist? Can we desalinate the water using generators and fossil fuels if we GM African trees to be more carbon hungry (already being done with nonAfrican trees), or will the CO2 be too great? Does global greening work anywhere or do the trees need to be near where the carbon emissions are?