How does planting trees minimize global warming

For instance, in land use changes — mostly deforestation — contributed four billion tonnes of CO2 emissions to the global total of 41 billion tonnes of CO2. However, simply stopping all our emissions is no longer enough. At this point we have emitted so much CO2, and left emissions cuts so late, that we are almost certain to miss our targets of limiting warming to 1. That means we must also find ways to actively remove CO2 from the air. All sorts of technological approaches have been proposed, but trees are an obvious contributor.

New trees can either be planted in regions that have been deforested reforestation or in places that have never had them before afforestation. As the trees grow they pull in CO2 through their leaves and convert it into carbohydrates, which they use to grow. So long as a tree lives, that carbon stays within it — and trees can live for decades or centuries. It follows that we should both stop chopping down forests — especially tropical ones like the Amazon, which store huge amounts of carbon — and start planting more.

By some estimates, trees can be an enormous carbon sink. Once those trees had matured , they could store billion tonnes of CO2. This finding has had immediate, fierce pushback from other climate scientists.

In October , the journal Science published four highly critical comments. These argued that the researchers had overestimated the carbon trees could store — by a factor of five. They also highlighted multiple mistakes. The criticism hit home and, in May , Crowther's team published an extensive correction , in which they admitted that some of their headline claims were "incorrect" and that the data contained "errors".

Replanting trees nearer the poles is not as effective at drawing back carbon as trees planted in the tropics Credit: Getty Images. The criticism has hit home. In May , Crowther's team published an extensive correction , in which they admitted that some of their headline claims were "incorrect" and that the data contained "errors".

The first issue is that trees are dark, at least compared to other things that might blanket the land, such as grass or snow. As a result, planting more trees typically makes the land darker. This means planting trees only helps stop climate change in certain places. Specifically, according to a study that has been repeatedly confirmed, the best place to plant new trees is the tropics , where trees grow fastest and thus trap the most CO2. In contrast, planting trees in snowy regions near the poles is likely to cause a net warming, while planting them in temperate climates — like that of the UK, much of Europe and parts of the US — may have no net effect on climate.

Others say this problem is overblown. She points out that the polar regions are warming faster than the rest of the planet, so much of the snow may melt in the coming decades — in which case planting trees will not make the ground that much darker. The other thing trees do is emit volatile chemicals into the air.

Every day or once a week, our original stories and digest of the web's top headlines deliver the full story, for free. A digest of the most pressing climate-related news, released every Tuesday and Friday. Get a daily email of our original, groundbreaking stories written by our national network of award-winning reporters. How to plant a trillion trees is a wide-open question, however. Forest scientists warn that massive tree planting programs could have unexpected consequences, and that cutting fossil fuel emissions is far more important in fighting global warming.

A more useful focus, they say, is to preserve and bolster the forests we already have. Fossil fuel burning and fires emit about 11 gigatons of carbon per year; forests, fields, grasslands and oceans absorb about 6 gigatons. So every year, about 5 gigatons go into the atmosphere. More trees could reduce the excess carbon dioxide that is warming the planet.

The idea that trees can help limit global warming is enshrined in the Paris climate agreement , with most countries including forest expansion as part of their plans to reduce emissions. Reports and studies from the Intergovernmental Panel on Climate Change estimate that nature-based solutions, including healthy forests, could provide up to one-third of the emissions reductions required by to meet the Paris Agreement targets. A Swiss study , for example, estimated that globally, there was the potential to protect and regrow trees on about 3.

Doing so, the study projected, would increase the global forest cover by 25 percent and capture and store about a quarter of the carbon in the atmosphere when the forests matured. Those figures are disputed, but the research has increased interest in the trillion trees idea, and the study is one of the supporting documents for the Trillion Trees Act in Congress.

Separate from the U. The main focus is to protect key forests like the Amazon, and to support natural regrowth in logged areas. Additionally, the 1T. That could help pay for high-tech tools like satellite data and artificial intelligence to guide precision forestry and to monitor tree and soil carbon storage. The measure was introduced by Rep. Bruce Westerman, an Arkansas Republican, on Feb.

At a Feb. Climate change. Tree planting is one of the simplest and most effective ways of tackling climate change caused by greenhouse gas. This story was originally published on the 1st of September You could help to make it all happen. This gives families reliable and lasting sources of food and income.