Through photosynthesis, plants take in carbon dioxide from the air and split it and use it (and water) to make carbohydrates. So surely plants can help us reduce carbon dioxide in the air? Possibly... But equally, the carbon in plants is then cycled back into the air in the carbon cycle (plants eat them...)
Before we started burning fossil fuels, the carbon from dead organisms was locked up underground. Pumping carbon dioxide back into these old gas wells could be an option.
Adding iron to seawater is another option so that more algae can grow in the oceans, locking up carbon as it grows. Some of this carbon is cycled back into the carbon cycle, but lots of it will be deposited at the bottom of the ocean as the algae dies. The problem with this is whether it can be carried out on a global scale.
Other problems we need to solve are how to capture the carbon before it enters back into the air; will we have to put bags over our car exhaust pipes? and over factory chimneys?!
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