“Planting a large number of trees is the most effective immediate solution to climate change.”

Tree plantings may be beneficial or detrimental for mitigating climate-change impacts, but the range of possibilities makes generalisations difficult. [...] Considering all these factors, tree plantings may be beneficial or detrimental for mitigating climate-change impacts, but the range of possibilities makes generalisations difficult. Their net benefit depends on many factors that differ between specific circumstances.

But while he says there's potential for using reforestation as a climate mitigation tool, he cautions there are many factors to consider and that planting trees will never be a substitute for decreasing fossil fuel emissions. “It's definitely not a solution by itself to addressing current climate change. To do that, we need to reduce human emissions of greenhouse gases.

The IPCC Panel requested the Task Force on National Greenhouse Gas Inventories (TFI) to develop a 'Methodology Report on Carbon Dioxide Removal Technologies, Carbon Capture Utilization and Storage,' with details agreed at the 63rd Plenary in Lima, Peru, in October 2025. The aim is to provide an updated scientific basis for estimating and reporting these technologies in national greenhouse gas inventories.

An international collaboration including Oregon State University scientists, published in Nature Climate Change in July 2024, found that using trees for climate change mitigation is more complicated than simply planting large numbers of them. The study, which synthesized data from thousands of reforestation sites, indicated that achieving the entire mitigation potential of reforestation over 30 years would amount to less than eight months of global greenhouse gas emissions.

A new study published in Science in September 2025 reevaluates suitable land for afforestation and reforestation, concluding that previous estimates were overly optimistic and that even if all suitable land were planted, carbon absorption by 2050 would barely exceed a single year of global fossil fuel emissions. The study underscores that forestation should complement, not substitute, reducing fossil fuel use, and is not a 'silver bullet' for climate change.

A 2019 study, with updates into 2026, highlights that while afforestation has substantial mitigation potential, estimates vary widely, and major risks and trade-offs, particularly with food security, are often not considered. Large-scale afforestation requires significant land, potentially reducing agricultural land and increasing food prices, and also bears risks to implementation and permanence, especially in regions with high investment risks and weak governance.

Nature-based climate solutions, such as planting trees, won't be anywhere near as big a part of the world's solution to climate change as governments currently plan for, and relying on them is 'risky' according to a report led by King's College London. Furthermore, the implementation and success of CDR will depend on being able to accurately measure its impact on carbon dioxide emissions – something that would require a monumental monitoring effort that would challenge even the richest, technologically developed nations.

Reforestation in low- and middle-income countries can remove up to 10 times more carbon dioxide from the atmosphere at lower cost than previously estimated, making this a potentially more important option to fight climate change, according to a study in Nature Climate Change. Using a mix of the two reforestation methods – replanting the forest in some locations, and letting nature take its course in others - could sequester more carbon than using only tree planting or natural regeneration alone, the researchers calculate.

Reforestation – the restoration of tree cover to areas that have been deforested – is a Natural Climate Solution that has been identified by the Intergovernmental Panel on Climate Change (IPCC) as a mitigation option with high potential. The study finds that there is up to 10 times more low-cost, carbon removal potential from well-planned reforestation projects than previous official estimates suggested.

Living car-free is the most impactful behavior by far in terms of reducing emissions. Similarly, going vegan is nearly 3 times more impactful for the climate than decreasing food waste, 9 times more impactful than decreasing consumption of packaged or processed goods, and 30 times more impactful than composting. WRI research shows that shifting a few key behaviors can significantly reduce emissions and climate impacts.

Science Feedback reported in June 2020 that while tree planting is a relatively cheap solution, it can only offset a fraction of human carbon emissions, with global fossil fuel emissions being about three times higher than the carbon sequestered by all land ecosystems annually. Scientists agree that tree planting is not a fast climate solution, as it takes decades for trees to store substantial carbon, and it can distract from the more immediate and crucial solution of reducing fossil fuel emissions.

“Reforestation is not a silver bullet,” said Bob Allen, a climate scientist at UC Riverside and the paper's lead author. “It's a powerful strategy, but it has to be paired with serious emissions reductions.” But even if every tree lost since the mid-19th century is replanted, the total effect won't cancel out human-generated warming. Cutting emissions remains essential.

Tree planting is considered one of the most effective tools for combating climate change and restoring biodiversity. But poorly planned reforestation and afforestation projects could increase carbon emissions and harm ecosystems.

According to scientists cited in a Guardian article, planting billions of trees globally is the biggest and cheapest way to tackle the climate crisis, with new research estimating it could remove two-thirds of all human-caused emissions. Professor Crowther stated that this solution is "available now" and that individuals can make a tangible impact by growing trees or supporting restoration organizations.

The main ways to stop climate change are to pressure government and business to: Keep fossil fuels in the ground. Invest in renewable energy. Switch to sustainable transport. Improve farming and encourage vegan diets. Restore nature to absorb more carbon. Protect forests like the Amazon.

Green spaces, such as parks and gardens, are important. They absorb carbon dioxide and are associated with lower levels of air pollution. They help to regulate temperature by cooling overheated urban areas, can reduce flood risk by absorbing surface rainwater and can provide important habitats for a wide variety of insects, animals, birds and amphibians.

Forests in the U.S. alone offset about 16 percent of annual greenhouse gas emissions. Ninety percent of Americans support tree planting as a climate change mitigation measure.

Climate change is an issue caused by a multitude of factors, and there is a wide range of solutions to combat it. These include technological, economic, natural and political solutions. Nature based solutions (also known as natural climate solutions) work with natural environments to help people adapt to the effects of change and disasters. They involve conserving, restoring, or better managing ecosystems to remove carbon dioxide (CO2) from the atmosphere.

We're living through a climate emergency, and planting trees is one of our most immediate and scalable defenses. Trees buy us time, capturing carbon now, not decades down the line. They're not just a symbol of climate hope, they're a tangible solution already in motion.

For the 2026 first assessment, students must understand various climate change mitigation strategies, including renewable energy transition, energy efficiency, carbon capture and storage (CCS), reforestation and afforestation, international agreements, and carbon taxes and trading. Reforestation and afforestation are listed as a key strategy for absorbing CO₂ and restoring ecosystems, but are presented alongside other methods without being singled out as the most effective or immediate.

The IPCC Sixth Assessment Report (2022) recognizes afforestation and reforestation as effective carbon dioxide removal methods but emphasizes they cannot replace rapid emissions reductions from fossil fuels, and their effectiveness varies by biome with potential albedo and biogeophysical effects reducing net cooling in some regions.