The only problem is that we don't have nearly enough space for that. An acre of trees stores ~393 tonnes of carbon dioxide permanently (in Vermont anyway, othe

The only problem is that we don't have nearly enough space for that. An acre of trees stores ~393 tonnes of carbon dioxide permanently (in Vermont anyway, other areas probably vary a lot) [1] Humans generate ~40 Gtonnes of CO2 a year. That means we need to be adding ~100 million acres of trees every year to capture that. There's currently 4 billion hectares of forest cover - that's around 10 billion acres. If we replanted every area which has seen deforestation since 1990 we'd get another 400 million acres, or 4 years of emissions. After that, we're fighting an uphill battle. Forests currently cover 31% of the earth. 29% of that surface is desert, 3% is urban areas and 10% is covered in ice. To keep on top of emissions we'd need to add 0.3% of the total each year globally, or 1.2% of the land which could actually grow trees. That might be doable in 5 years, but 10 years? 15 years? 30 years? Re-forestation may be part of the solution, but it can't be the only part. [1] (PDF}: http://fpr.vermont.gov/sites/fpr/files/Forest_and_Forestry/The_Forest_Ecosystem/Library/Forest%20Carbon%20Fact%20Sheet%20-Mar2017.pdf http://fpr.vermont.gov/sites/fpr/files/Forest_and_Forestry/T... [2]: http://www.earth-policy.org/?/indicators/C56/ http://www.earth-policy.org/?/indicators/C56/