2010年人为排放(不包括土地利用变化)约(91.67亿吨)[1]。您的数据在树上控股每年13磅(5.9公斤)的碳的排放量相当于每公吨169.6树。所以拿起所有的排放从2010年需要1545000000000棵树。一个成熟森林只有[每英亩100棵树][2](400每公顷),所以你需要成熟15545000000英亩的森林。这等于面积24290000 mi 2 <一口> < /一口>(62910000公里<一口> 2 < /一口>)。这是大约的土地面积(亚洲、欧洲和澳大利亚的总和)[3]!地球上的土地面积大约是150000000公里(2 <一口> < /一口>][4],所以原则上我们需要添加覆盖到42%的当前土地(或者我们可以从深海层,土壤填埋1/5th海洋!)为了种植足够的树木来解决这个问题。这也假定13磅(5.9公斤)的碳图是成熟的森林,而不是种植树木为进一步讨论(见注释)。如果这个值是对年轻的发展中树,它将表明龙润少是可以做到的。如果13磅开发森林,也许更大的数量可以被移除在早期作为一个临时更快解决。 There is also the problem that forested land is likely to have a lower albedo than the land surface that it covers, and hence the planet will reflect less sunlight back into space which would lead to some extra warming, so we would also need to compensate for that somehow. Apparently [about 26% of Earth's land][5] is already covered with forests. I rather doubt over half of the uncovered land surface is suitable for new forests, the continents have large bands either side of the equator that are generally too arid, and the regions close to the poles are too cold. In short, it isn't going to work, even with the most generous assumptions about forest CO2 exchanges (unless of course I have made an arithmetic error, which is definitely a possibility). [1]: http://cdiac.ornl.gov/ftp/ndp030/global.1751_2010.ems [2]: http://books.google.co.uk/books?id=ML3jtMUzRZgC&pg=PA123&lpg=PA123&dq=trees%20per%20acre%20mature%20forest&source=bl&ots=YrctJbM_L7&sig=gL5m4Uma36o1QM1bpl45fHswQkE&hl=en&sa=X&ei=TPRAVP_QGfHg7QayyYH4DQ&ved=0CCMQ6AEwAA#v=onepage&q=trees%20per%20acre%20mature%20forest&f=false [3]: https://www.infoplease.com/world/world-geography/world-land-areas-and-elevations [4]: http://en.wikipedia.org/wiki/Earth [5]: https://en.wikipedia.org/wiki/List_of_countries_by_forest_area
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