Does planting trees help fight climate change?
Planting and regrowing forests can pull real carbon dioxide out of the air, but how much depends on where, when and how it is done, and it cannot replace cutting fossil fuel emissions.
Covers: This page examines the scientific evidence on how tree planting and reforestation affect atmospheric carbon dioxide and global climate. It covers carbon sequestration rates, the role of forests in the carbon cycle, and the limits and trade-offs of tree-planting initiatives. It does not provide guidance on specific tree-planting projects or carbon offset schemes.
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The short answer
Evidence-backed AI-prepared starting mapPlanting and regrowing forests can remove real quantities of carbon dioxide from the atmosphere, but the size of the benefit depends heavily on where, when and how it is done, and it is not a substitute for cutting fossil fuel emissions. In China, planted forests covered 89.6 million hectares, 35.5% of the country's forest area in 2015, and stored an estimated 10.3±0.4 Pg CO2e in biomass over roughly 1980-2015; reduced fragmentation of the surrounding forest added a further net 0.5±0.2 Pg CO2e, about 6.6±2.7% on top of the direct benefit. Scenario modelling suggests that ending gross deforestation by 2030 could deliver removals of about 30 Pg C by 2100, while merely balancing forest area still emits 4-9 Pg C. Reviews conclude that forest sinks only close the gap to Paris targets when combined with cutting emissions from energy, industry and land use.123
- Evidence 18
- Interpretation 1
In brief
Planted and regrown forests do remove carbon: China's planted forests stored an estimated 10.3±0.4 Pg CO2e in biomass over about 1980-2015, with reduced fragmentation adding a net 0.5±0.2 Pg CO2e.1
Evidence-backedPolicy timing and location dominate outcomes: ending gross deforestation by 2030 could remove about 30 Pg C by 2100, while a mere net forest area balance still emits 4-9 Pg C.2
Evidence-backedPlanting is not purely a carbon benefit: biophysical effects such as reduced albedo can offset part of the cooling, as seen in the Chinese case where a -0.9 Pg CO2e warming effect partly cancelled the biomass gain.1
Evidence-backedSpecies and site choice change the result: in boreal Canada, deciduous stands were projected to sequester 347.1 tDM ha-1 versus 171 tDM ha-1 for conifers in the warmest scenario.4
Evidence-backedForest sinks are judged to work only alongside deep emission cuts: the review concludes that integrated deployment of mitigation, sink expansion and ecosystem services is what closes the gap to Paris targets.3
Evidence-backed
At a glance
The picture in numbers
Live · updated just now
10.3 Pg CO2e
- Ending gross deforestation by 2030 (removals)30 Pg C
- Net forest area balance (emissions)4 Pg C
- Net forest area balance (emissions, high end)9 Pg C
- Deciduous347.1 tDM ha-1
- Coniferous171 tDM ha-1
35.5%
36 in every 100
The evidence behind it
5 sources- Reviews of many studies1
- Other studies and data3
- Background1
Published in 2026
| Source | Kind | Year |
|---|---|---|
| Extra Climate Benefits From Afforestation Due to Reduced Forest Fragmentation in China. | Other studies and data | 2026 |
| National pathways of land-use CO₂ emissions in the 21st century. | Other studies and data | 2026 |
| A critical review of carbon emission mitigation, carbon sink expansion, and leveraging ecosystem services. | Reviews of many studies | 2026 |
| Deciduous afforestation as a natural climate solution: impacts on biomass and carbon sequestration in boreal forests of Canada. | Other studies and data | 2026 |
| Climate change (Wikipedia) | Background | Unknown |
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What it means for you
Which fits you?
Pick the situation closest to yours. Each answer says what it rests on.
If you want to know whether planting trees is worth doing at all
the evidence supports planting as a genuine carbon removal measure, but the review literature concludes it only closes the gap to Paris targets when combined with cutting emissions from energy, industry and land use.3
Evidence-backedIf you are weighing where planting money should go
the scenario modelling points to tropical regions as decisive: the strongest projected sinks emerge in China and Indonesia, while Brazil and the Democratic Republic of the Congo dominate global sources, and early, ambitious land governance is described as essential.2
Evidence-backedIf you are choosing between protecting existing forest and planting new forest
ending gross deforestation by 2030 is projected to deliver about -30 Pg C by 2100, whereas a net forest area balance still emits 4-9 Pg C, so protection and restoration timing matter as much as new planting.2
Evidence-backedIf you are deciding which species to plant in boreal or cold-climate regions
simulations for boreal Canada found deciduous stands sequestered more carbon than conifers under all climate scenarios, with the largest gap in the warmest scenario, and conifers were 65.6% more water stressed in August under that scenario.4
Evidence-backedIf you are assessing a planting project's climate benefit
count both the carbon stored in biomass and the biophysical effects: in China, reduced fragmentation added a net 0.5±0.2 Pg CO2e, only 6.6±2.7% above the direct benefit, after a -0.9 Pg CO2e warming effect was netted off.1
Evidence-backedIf you are treating tree planting as a substitute for reducing fossil fuel use
the dominant driver of rising atmospheric CO2 is fossil fuel burning, with deforestation and some agricultural and industrial practices also contributing, so planting addresses a smaller share of the problem than emission cuts.5
Evidence-backedThe full story · 2 chapters
01
What the evidence shows about carbon removal
AI summary:Planted forests in China stored carbon and reduced fragmentation added a smaller net gain, while global scenarios show policy timing and species choice shape the outcome.
Evidence-backed: Planted forests do accumulate carbon. In China, planted forest area reached 89.6 million hectares by 2015, 35.5% of the national forest area, and the biomass increase in those planted forests is estimated at 10.3±0.4 Pg CO2e over about 1980-2015. The same study found that as planting turned 51.8 million hectares of edge forest into interior forest, reduced fragmentation added a cumulative 1.4±0.2 Pg CO2e, of which a biophysical warming effect of -0.9 Pg CO2e partly cancels the cooling, leaving a net extra gain of 0.5±0.2 Pg CO2e, or 6.6±2.7% above the direct climate benefit of the planted forests.1
Evidence-backed: At global scale, the trajectory of land-use carbon depends on policy choices. Scenario modelling with the OSCAR Earth system model across 150 socioeconomic and policy scenarios found that deforestation and forest regrowth dominate the variability in land-use CO2 emissions, and that policy timing and ambition exert strong control. Ending gross deforestation by 2030 produces large, persistent removals of roughly -30 Pg C by 2100, whereas a net forest area balance still emits 4-9 Pg C. The strongest projected sinks emerge in China and Indonesia, while Brazil and the Democratic Republic of the Congo dominate global sources.2
Evidence-backed: Species choice matters in some regions. In boreal Canada, simulations of converting conifer stands to deciduous species found deciduous stands sequestered more carbon under all climate scenarios, with the gap widest in the warmest scenario: 347.1 tDM ha-1 for deciduous versus 171 tDM ha-1 for coniferous. Conifers were 65.6% more water stressed than deciduous species in August under the warmest scenario, and northern sites were less stressed than southern ones.4
Evidence-backed: Forests are one part of the carbon cycle, not the whole of it. Atmospheric carbon dioxide is now roughly 50% higher than at the end of the pre-industrial era, driven especially by fossil fuel burning since the Industrial Revolution, with deforestation and some agricultural and industrial practices also releasing greenhouse gases.5
02
Limits, trade-offs and how planting fits with cutting emissions
AI summary:A review concludes forests only help close the Paris gap alongside deep emission cuts, and planting carries trade-offs such as warming effects and loss to fire or drought.
Evidence-backed: A critical review of mitigation, carbon sinks and ecosystem services concludes that only the integrated application of all three pillars offers a practical roadmap to close the gap between current trajectories and Paris Agreement targets. It argues that sectoral decarbonisation through renewables and electrification, combined with natural and engineered sinks, is what delivers the required scale and speed, and that integrated deployment rather than isolated actions is what matters. It calls for coherent policies, technological innovation, transparent monitoring and strengthened international cooperation, and notes co-benefits for biodiversity and resilience.3
Evidence-backed: The China study shows that the climate effect of planting is not purely a carbon story: reduced fragmentation brought a biophysical warming effect of -0.9 Pg CO2e that partly offset the cooling from added biomass, so the net gain was smaller than the gross carbon figures alone would suggest. The boreal study similarly frames species choice as a decision with consequences beyond carbon, including habitat, wildfire risk and timber supply.14
Interpretation: Because fossil fuel use is the dominant driver of rising atmospheric CO2, tree planting addresses a smaller and partly reversible part of the problem than emission cuts do. Forests can be lost to fire, drought, pests or later land-use change, and the scenario work shows that whether the land sector becomes a durable sink depends on early and ambitious land governance, particularly in tropical regions.52
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- 1Extra Climate Benefits From Afforestation Due to Reduced Forest Fragmentation in China.Advanced science (Weinheim, Baden-Wurttemberg, Germany) (Meng et al.)Published Jun 15, 2026Checked Oct 4, 2026
“Here, CO2 sequestration from increased biomass (biogeochemical effect) and emissions from decreased albedo (biophysical effect) of transformed forests in China are estimated, using multiple high-resolution remote-sensing datasets. The planted forest area (89.6 M ha) accounted for 35.5% of China's forest area in 2015, transforming 51.8 M ha of edge forests into interior forests. A cumulative increase of 1.4±0.2 Pg CO2e in the transformed forests is found, compared with a biomass increase of 10.3±0.4 Pg CO2e in the planted forests over ~1980-2015. These transformed forests also induce a biophysical warming effect of -0.9 Pg CO2e, partially offsetting the cooling effect from increased biomass. Combining both effects, transformed forests provide a net CO2e gain of 0.5±0.2 Pg CO2e, representing an extra 6.6±2.7% of the direct climate benefits from planted forests. This study reveals previously ignored extra climate benefits from reduced forest fragmentation alongside forest expansion, offering new perspectives on mitigating climate warming through afforestation.”
- 2National pathways of land-use CO₂ emissions in the 21st century.Nature communications (Zhang et al.)Published Jun 24, 2026Checked Oct 4, 2026
“Land-use and land-cover change (LULCC) is a major source of anthropogenic CO₂ emissions, yet projections remain scarce. Here, we use the reduced-complexity Earth system model OSCAR to generate national LULCC carbon emission trajectories through 2100, across 150 socioeconomic and policy-relevant scenarios. Deforestation and forest regrowth dominate variability in LULCC carbon emission, with policy timing and ambition exerting strong control. Ending gross deforestation by 2030 yields large, persistent removals (about -30 Pg C by 2100), whereas net forest area balance still emits 4-9 Pg C. The strongest sinks are projected to emerge in China and Indonesia, while Brazil and the Democratic Republic of the Congo dominate global sources. The accompanying open dataset enables country-level scenario assembly and policy evaluation. Our findings underscore that early and ambitious land governance, particularly in tropical regions, is essential for transforming the land sector into a durable carbon sink aligned with global temperature goals.”
- 3A critical review of carbon emission mitigation, carbon sink expansion, and leveraging ecosystem services.Journal of the Air & Waste Management Association (1995) (Li et al.)Published Apr 23, 2026Checked Oct 4, 2026
“This study suggests that only the integrated application of all three pillars provides a practical roadmap to close the gap between current trajectories and Paris Agreement targets, requiring urgent scaling through coherent policies, technological innovation, transparent monitoring, and strengthened international cooperation.Implications: This review critically synthesizes carbon emission mitigation, carbon sink expansion, and ecosystem service leveraging into a unified framework. It demonstrates that sectoral decarbonization through renewables and electrification combined with natural and engineered sinks can close the gap to Paris targets. The findings provide policymakers with actionable pathways to achieve net zero while securing co benefits for biodiversity and resilience. Critically, integrated deployment rather than isolated actions delivers the required scale and speed. This work advances climate policy design by balancing ecological sustainability with socioeconomic development, urging immediate cross sectoral cooperation and scaled investment in both technological and nature based solutions.”
- 4Deciduous afforestation as a natural climate solution: impacts on biomass and carbon sequestration in boreal forests of Canada.Carbon balance and management (du et al.)Published Jan 3, 2026Checked Oct 4, 2026
“In addition, we investigated the modelled effects of converting from conifer to deciduous species on stand level soil water and vapor pressure deficit responses to climate.ResultsWe found that deciduous simulations sequester more carbon under all climate scenarios, with the greatest difference occurring in the warmest scenario (171 tDM ha-1 for coniferous species compared to 347.1 tDM ha-1 for deciduous species). Coniferous species were generally more water stressed than deciduous species; conifers were generally 65.6% more stressed compared to deciduous species in August under the warmest climate scenario, while northern sites were less stressed than southern sites.ConclusionsSimulations such as these highlight the importance of modelling and consideration of different planting scenarios in decision-making to ensure successful resource allocation. They also demonstrate the potential of nature-based adaptation solutions projects, and the role deciduous afforestation can play in provision of habitat, modifying wildfire risk and northern boreal biomass and timber supply.”
- 5Climate change (Wikipedia)WikipediaPublished Oct 3, 2026Checked Oct 4, 2026
“Present-day climate change includes both global warming—the ongoing increase in global average temperature—and its wider effects on Earth's climate system. In a broader sense, climate change also includes previous long-term changes to Earth's climate. The modern-day rise in global temperatures is driven by human activities, especially fossil fuel (coal, oil and natural gas) burning since the Industrial Revolution. Fossil fuel use, deforestation, and some agricultural and industrial practices release greenhouse gases. These gases absorb some of the heat that the Earth radiates after it warms from sunlight, warming the lower atmosphere. Earth's atmosphere now has roughly 50% more carbon dioxide, the main gas driving global warming, than it did at the end of the pre-industrial era, reaching levels not seen for millions of years. Climate change has an increasingly large impact on the environment. Heat waves and wildfires are becoming more common. Amplified warming in the Arctic has contributed to thawing permafrost, retreat of glaciers and sea ice decline. Higher temperatures are also causing more intense storms, droughts, and other weather extremes.”
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Published 1 time since Oct 4, 2026.
- Version 2Oct 4, 2026Live now
AI-prepared Starting Map from live research.
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Open questions
How much carbon could large-scale planting outside China and the boreal region actually remove, given that the available estimates come from single-country or single-region studies?
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How large are albedo, water and biodiversity trade-offs of afforestation across different latitudes, beyond the biophysical warming effect quantified for China?
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How durable are forest carbon sinks under fire, drought and changing policy, given that the 30 Pg C removal estimate depends on ending gross deforestation by 2030?
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How does a given investment in tree planting compare with the same investment in cutting fossil fuel emissions, in terms of tonnes of CO2 avoided or removed?
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