United States

United States We cannot allow America's forests to decline.

The Problem

America’s forests are facing a perfect storm of threats. Infestations of diseases and invasive pests like the Emerald Ash Borer are killing tens of thousands of acres of trees nationally. Increased development is splitting once-vast forests into small fragments, and a history of suppressing natural fires has created unhealthy stands of forests. Additionally, climate change is altering the size and growth patterns of forests.

Without these forests, 50 percent of the nation’s water supply will go unfiltered and 12 percent of U.S. carbon emissions won’t be absorbed. Iconic and important plant and animal species will lose their home, and more than $14.5 billion generated on Forest Service lands – money that goes back to local communities – will be lost.

How You Can Help

The Plant a Billion projects in the United States are rejuvenating iconic forests in key locations throughout the country. The Nature Conservancy is making sure each dollar donated can have the most effect on creating healthy forest habitat by using two methods: planting tree seedlings in areas that have been highly degraded, and assisting the natural regeneration of the forest by removing barriers to the forest’s ability to heal itself.

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America’s forests are now facing a perfect storm of threats. Today, a forested area the size of California is in an unhealthy condition.

Use our map to learn about the people and animals of the forest.

Help Conserve America’s Forests

Increased development is splitting once-vast forests into small fragments, putting wildlife at risk and endangering the ability of these forests to provide services like clean air and water. Help us conserve and expand forests in the United States.

Help Protect Forests from Invasive Species

Infestations of disease and invasive pests like the Emerald Ash Borer are killing native species of trees. Plant a Billion projects are working to remove invasive species and protect stands of forests from invasions.

Help Stabilize the World’s Climate

Forests are the lungs of the Earth, storing enormous amounts of carbon dioxide and releasing oxygen in a never-ending cycle. Large, healthy forests can help stave off global warming. Plant a Billion projects in the United States will increase the ability of America’s forests to filter air.

Help Protect Sources of Fresh Water

Forests are critical in maintaining the Earth's limited supply of drinking and fresh water, and many large U.S. cities depend on healthy forests to provide a source of clean water. Forests filter 50 percent of the nation’s water supply. Help protect these sources of fresh water for people and nature.

Learn More About Our U.S. Reforestation Projects



Central Appalachians

The tallest peaks of the Central Appalachian Mountains harbor rare red spruce forests—vestiges of the last ice age that are home to amazing biodiversity.

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Longleaf Pine

These towering pines once dominated the landscape of the Southeastern U.S. Today, fewer than 5 percent remain.

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Mississippi Bottomland Hardwood

Once heavily forested, the lower Mississippi River Valley, also known as “the Delta”, has largely been converted to agriculture over the past two centuries, but restoration is building back these iconic forests.

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Shortleaf Pine

Shortleaf pine ranges from southern New York to Florida and west into Oklahoma and Texas, but has seen a rapid decline in the past several decades. We are working to restore these important forests.

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city-trees-268x268Urban Trees

Nearly one-quarter of America’s tree canopy exists in our backyards, city streets and parks, and they are essential to healthy communities.

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