Dr Dave
Interesting numbers - by Toronto forest - do you mean a typical Canadian forest? - Would Brazilian rainforest suck up a similar amount?
Actually - (having done my time tree planting) - on a global scale 32,000 sq miles isn't that much. Once you created this new forest annual maintenance would be fairly cheap.
Some sort of industry fund to create and maintain this "air travel forest" spread worldwide would not have to be that expensive. Just don't allow any EU or UN organization anywhere near it.
As a bonus all the environmentalists could continue to jet around to their conferences and create more pilot jobs.
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Dr Dave
As an aside - in North America we are gaining forests - have being for the last 100 years. What we are losing is agricultural land to development and reforestation.
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