Wren | Our Projects

Our projects

The Wren Classic Portfolio

How we choose our projects

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Mangrove planter Mr. Win Maung (left), and youth ambassador Miss Earth Baitong Jareerat (right), inside their successfully restored mangroves.

Wren members fund a variety of climate solutions.

1. Engineered carbon dioxide removal

These projects capture CO₂ and store it permanently, preventing release for centuries to millennia.

Biochar carbon removal

This project uses a process called pyrolysis to convert sawmill and forest residues into biochar, a carbon-rich charcoal. The biochar can then be applied to farmlands to improve soil health and crop output.

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Enhanced rock weathering

This project spreads crushed silicate rocks such as basalt on agricultural land, speeding up the Earth’s natural weathering cycle, and permanently removing carbon from the atmosphere.

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Enhanced weathering on rice paddies

This project permanently removes CO₂ from the atmosphere and supports smallholder farmers in India, Zambia, and Tanzania. By spreading abundant, locally-sourced crushed rock on rice paddies, the natural weathering process is accelerated to absorb CO₂.

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Underground biomass storage

This project removes CO₂ from the atmosphere by taking residual or waste biomass leftover from timber and agricultural operations and producing carbon blocks that are stored safely underground.

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2. Policy

These projects work to advance and implement climate-positive laws and regulations.

Carbon Gap

This project advances policies that maximize Europe’s contribution to the rapid and responsible global scale-up of carbon dioxide removal (CDR) needed for effective climate change mitigation.

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Carbon Removal Alliance

This project advances policies that support a diverse set of permanent, high-quality carbon removal technologies.

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3. Nature-based solutions

These projects protect, restore, or sustainably manage ecosystems to address climate change while supporting biodiversity and human well-being.

Forest resilience against wildfires

This project restores and protects forests, watersheds, ecosystems, and communities in the Western United States by catalyzing funds and gathering partners needed to accelerate ecological restoration projects.

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Improved forest management in Maine

This project helps small landowners in Maine shift from short-rotation harvest cycles to longer-term forest management that stores and sequesters more carbon.

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Mangrove planting in Myanmar

This project reforests degraded mangrove ecosystems in Myanmar’s Ayeyarwady Division.

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Tech-enabled rainforest protection

This project works with Indigenous Amazonians to protect their rainforest home. Using satellite monitoring and drones, Indigenous monitors detect deforestation early. This allows communities to prevent deforestation before it reaches a large scale.

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4. Super pollutant mitigation

These projects prevent the emissions of powerful, short-lived greenhouse gases like methane and HFCs, which trap far more heat than CO₂ but remain in the atmosphere for a shorter time.

Adipic acid nitrous oxide abatement

This project reduces nitrous oxide (N₂O) emissions from a chemical plant in Florida. N₂O is 273× more harmful than CO₂ and in 2022, it was responsible for 6% of human-generated greenhouse gas emissions in the United States.

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Landfill methane abatement

This project captures methane (CH₄) from a landfill and prevents its release into the atmosphere by converting it into energy or less harmful gases using electricity generators and high-temperature enclosed flares.

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Refrigerant destruction

This project permanently destroys harmful refrigerants that would otherwise be released into the atmosphere—thereby fighting global warming, and helping to restore the planet's ozone layer.

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5. Other

Some projects don’t fit neatly into one of our main categories, but they still make a meaningful impact in the fight against climate change.

Clean cookstoves in East Africa

This project reduces greenhouse gas emissions by transitioning households and businesses in East Africa from charcoal to clean alternatives, decreasing the reliance on non-renewable fuels.

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Members fund a mix of climate solutions via The Wren Classic Portfolio

About

The Wren Classic Portfolio offsets carbon through a curated selection of effective climate projects. Allocations are periodically updated to maximize impact.
We look for projects with proven results, lasting impact, and strong support for systems change. These projects wouldn’t happen without your funding.

Portfolio updates

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June 17, 2026\
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How wood residues create clean energy, biochar, and jobs](https://www.wren.co/blog/how-wood-residues-create-clean-energy-biochar-and-jobs)

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May 28, 2026\
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Advancing carbon removal from policy protection to deployment](https://www.wren.co/blog/advancing-carbon-removal-from-policy-protection-to-deployment)

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April 16, 2026\
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5 million more tonnes of CO₂e avoided and counting](https://www.wren.co/blog/5-million-more-tonnes-of-co-e-avoided-and-counting)

See all updates

How is the money spent?

Category

Portfolio allocation

Contributions by month

2019 2020 2021 2022 2023 2024 2025 2026 $100K $200K $300K $400K

How we choose our projects

We choose projects that maximize climate impact per dollar and contribute to sustainable and equitable systems change.

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For example, lidar scans are used to assess forest health and carbon storage potential.

1. Proven results

We evaluate projects against 250+ indicators to ensure projects meet our standards for climate impact and systems change. We go through hundreds of pages of project documents and dig deep into measurements and methods to ensure the use of best-in-class carbon accounting techniques.

We cross-check our findings with peer-reviewed research and spend hours talking with industry experts to surface any unseen risks. Typically, this process takes a month or more and as a result, less than 5% of projects that come our way make it onto our platform.

How we choose projects

  1. Proven results
  2. Lasting impact
  3. Wouldn’t happen without your funding
  4. Support for systems change

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Wren members fund the permanent destruction of potent greenhouse gas emissions from refrigerants.

2. Lasting impact

We choose climate projects that are able to remove or keep carbon out of the atmosphere. For nature-based projects, like tree planting, we make sure there is a “buffer” built into the project design to account for risks like wildfire or logging. For projects like enhanced mineral weathering, we make sure the proper measurements are used so we know when the carbon is removed and for how long it will stay out of the atmosphere (this can be up to thousands of years!).

How we choose projects

  1. Proven results
  2. Lasting impact
  3. Wouldn’t happen without your funding
  4. Support for systems change

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For most projects, Wren is one of the sole purchasers of carbon credits, limiting the risk of double counted credits.

3. Wouldn’t happen without your funding

Every project on Wren needs funding in order to succeed. That funding goes towards purchasing the supplies and paying for the team members necessary to make those projects happen. If a project would be profitable on its own without us, it isn't eligible for Wren.

For instance, if a landowner has protected their forest for hundreds of years and there’s no reason they’d start logging now, we won’t fund them. Their forest will likely stay standing even without money from carbon offsets.

Similarly, in most countries today renewable energy projects can be highly profitable. We wouldn’t fund a renewable energy project unless we could be certain it needs our funding.

How we choose projects

  1. Proven results
  2. Lasting impact
  3. Wouldn’t happen without your funding
  4. Support for systems change

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Drone footage provides early warning of deforestation, helping communities and authorities in the Amazon protect their forests.

4. Support for systems change

Wren’s goal is to support the systems change needed to build a sustainable and equitable future in which human and planetary health is secure. To support this, we choose projects that contribute to social, cultural, political, and economic change. For example, we fund policy advocacy because we know we need governments to step up and regulate corporations.

We also support innovative carbon removal technologies because we know our funding can help these companies scale. We also think deeply about how a project advances the United Nations Sustainable Development Goals and prioritize projects that center the voices of those on the frontline of the climate crisis – such as Indigenous Peoples and Local Communities.

How we choose projects

  1. Proven results
  2. Lasting impact
  3. Wouldn’t happen without your funding
  4. Support for systems change

Archived projects

When projects are archived on Wren, they will appear here along with a reason for archival.

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Take real, effective climate action with Wren’s all-in-one climate platform.

How we choose our projects

  1. Proven results
  2. Lasting impact
  3. Wouldn’t happen without your funding
  4. Support for systems change