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Here is a "Plan B" menu of geoengineering solutions that can be broken down into two categories: dimming the sun, which remains highly controversial, and capturing carbon dioxide (CO2).DRAWBACKS: Even if it works as intended, solar radiation management would do nothing to reduce atmospheric CO2, which is making oceans too acidic.Microscopic ocean plants called phytoplankton gobble up carbon dioxide and drag it to the bottom of the ocean when they die.Natural weathering of rocks – a chemical process – removes about 1 billion tons of CO2 from the atmosphere every year, about 2 percent of total man-made C02 emissions.The net result is "negative emissions," with less CO2 in the atmosphere than when the process started.Experiments have shown it is possible to suck CO2 directly from the air, converting it into fuel pellets or storing it underground.Extensive planting of trees could slow the concentration of CO2 in the atmosphere, currently at more than 400 parts per million.
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