You might find the answers here and here helpful. Basically, trees require carbon dioxide for them to make food. The process of Photosynthesis (how plants turn sunlight into food) requires carbon dioxide and emits a “waste” result of oxygen. This helps reduce the amount of carbon that we put into the air, but planting trees isn’t really enough of a solution to combat the negative effects of carbon (e.g. global warming) by itself.
Other plants, algae and even some bacteria use photosynthesis to make food, so really all plants help reduce C02 levels a little–but big mature trees can clean a lot more air.
Yes. trees suck in carbon dioxide and let out oxygen.
As above posted, trees definitely reduce carbon dioxide (by “eating” it). When viewed on larger scales – entire forests instead of single trees – the value of trees as “carbon sinks” becomes tremendous. The Amazon rain forest alone usually pulls 1.5 billion tonnes of carbon dioxide out of the atmosphere every year.
It’s worth noting that over the next few years, the Amazon rain forest is predicted to emit more carbon dioxide than it absorbs. This is due to the extreme severity of the 2010 drought – the carbon dioxide released by the now dead and dying trees (trees store CO2 as they grow) is expected to total approximately 8 billion tonnes. When combined with the carbon dioxide emissions of the slightly less severe 2005 drought (which was, at the time, considered a once-in-a-century event), the net CO2 emissions of the forest are expected to cancel out all the forest’s carbon absorption over the last decade.
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