This is how trees could help solve the climate issue.

Updated: Jan 18

There are 300 + gigatonnes of carbon created due to humans and the activity we undertake. This has been since the start of the industrial revolution. As the temperature of the planet rise, the activity of micro-organisms in the soil increase. And this increases carbon emissions. The vast amount of Earth's carbon is stored in the soil, so this is speeding up climate change.


Strategies on how to stop this have been the topic of political discussions, economic planning and scientific research for years. Their efficacy, however, has as yet been limited. The reason? There seems to be a Catch-22 to our climate crisis.

On average, human activities add 10 gigatonnes of carbon to the atmosphere each year. Reducing human-induced emissions has been the focus of much attention. Notable organisations, such as Project Drawdown, list effective refrigeration management when recycling or disposing of refrigerants as the top solution, with the potential to save 24 gigatonnes of carbon in future emissions. Converting to a plant-only diet on a global scale could save up to 18 gigatonnes.


But all of the proposed solutions – from electricity generation, to transport, food, education and land use – have one thing in common: primarily, they only prevent future emissions. To stop climate change, we must draw down the carbon already emitted into the atmosphere.

How do we do this? Ecologically speaking, trees are the most effective means to capture and store carbon. Until now, forest restoration has not been seriously considered as a climate change mitigation strategy because we have no quantitative information about what is possible. Without any scientific evidence, we have not been able to quantify the true contribution of forest restoration, and we don’t know whether this could capture an extra 10 or 110 gigatonnes of carbon.

By creating a global network of ecologists with ground-sourced data from 1.2 million locations across the world and pairing this with satellite data, the Crowther Lab has used machine learning to create the first spatially explicit map of the entire global forest system.


What does this mean? Once mature, these new forests could store 205 billion tonnes of carbon: about two thirds of the 300 billion tonnes of carbon that has been released into the atmosphere as a result of human activity since the Industrial Revolution. Given this immense impact on climate change, the Crowther Lab’s data, recently published in the journal Science, not only confirms the efficacy of the age-old concept of tree restoration, but places it as the number one solution available.

We are at the start of a massive and ever-growing movement of people trying to do something about climate change. More than 1.5 million people have marched for the climate crisis in recent months. If we could harness all of this positive energy and get behind this unifying goal, restoring Earth’s ecosystems would have the immense power to restore our climate.


This is the power of restoration. Many governments around the globe have already pledged to restore forest systems – Australia and New Zealand, for example, each plan to plant 1 billion trees. But as a nature-based solution, citizens must not purely rely on the engagement of governments to achieve effective restoration. If we inspired and guided millions of global citizens to get together and engage in this, the impact would be tremendous.


We suggest three different, but equally simple and straightforward ways for getting involved as a citizen:

1. Restore: start planting trees – in your garden or in your local community, it’s easy to do and fun. Try to contact local authorities, scientists or NGOs which can give you extra information about local species that could be suitable for restoration. The maps on the Crowther Lab website support you in finding the best locations for restoring trees.

2. Support: many organisations and NGOs around the world are actively working on the restoration of vegetation and soils.

3. Be a smart consumer: as consumers we can make conscious decisions that can favour the protection of the planet. By supporting companies and activities that aim for a sustainable planet, buyer power can go a long way in the fight against climate change.

For consistency, in this article we have converted all CO2 figures to carbon. 44 grams of CO2 has approximately 12 grams of carbon.


Written by


, Assistant Professor of Global Ecosystem Ecology, Institute for Integrative Biology, ETH Zurich

The views expressed in this article are those of the author alone and not the World Economic Forum.



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