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How would an afforestation of the Sahara Desert cost?

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This is an impossible question to answer. In order for a desert to become forested it first needs top-soil (which is a mix of decaying organic material and minerals). read more

Water management is difficult at first, because desert soil will let the water drain away. The lack of shade means high evaporation, plus the sandy soil means water loss in that direction too. Usually a water catchment system is required to kickstart the process. read more

by an afforested Sahara desert and Australian Outback could compensate for CO 2 released by fossil fuel burning. In the Sahara, the afforestation proposal consists of planting 5-8 year old Eucalyptus grandis plantations (100 m canopy height) over a landmass of 9.8 x 108 ha at a density of 1,000 trees per ha. read more

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