It has been estimated by a U.K. tree-planting offset company that planting 7 trees per year per person, will save 7 metric tonnes of CO2 emissions per year. On average, broad-leafed trees are said to “breathe in” and store 1 metric tonne of CO2 over their 100 year lifespan. The U.S. uses about 20 metric tonnes of carbon per year per person (the U.K. uses about 10), so planting 14 trees per year every year you are alive is a reasonable way to offset CO2 emissions for U.S. citizens (based on the U.K model).
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