In Iowa, activists use faith to mobilize farmers in a movement to adopt new measures like perennial crops to sequester carbon in their soils, and to get paid for doing it.

California’s largest lake is shrinking and migratory birds are disappearing as its water is now too salty for fish — an environmental disaster and a health hazard for humans.

Where the Colorado River approaches the Sea of Cortez, conservationists re-plant forests and promote wildlife habitat to revive the Delta after decades of neglect and desertification.

To protect one of Arizona’s last perennially flowing rivers, smart stewardship minimizes irrigation and clears invasive plants.

On the Continental Divide in Colorado’s Rocky Mountains, residents support a plan to create new wilderness and wildlife conservation areas, including the nation’s first national historic landscape to honor veterans of the Second World War. In southern Utah, the remote and untamed Escalante River faces a major threat from invasive plants as it winds through spectacular redrock canyons; volunteers chop their way through choking stands of Russian olive to unblock the river and keep it wild and free. A training program in Georgia educates teachers in a new approach to science teaching called 3-D Science – getting teachers and students outside to observe their own surroundings and letting kids’ natural curiosity lead them to learn more.

Where the Colorado River approaches the Sea of Cortez, a new agreement between the U.S. and Mexico shares the river’s water during times of drought and surplus and dedicates water to the environment, restoring flows and habitat along the river and at the Delta. Conservationists are working hard to re-plant forests and promote wildlife habitat to revive the Delta after years of neglect and desertification. On the leading edge of agricultural technology, young farmers are using data to minimize costs, improve yield and increase profits; a fourth-generation farmer in Illinois shows how it’s done.

To protect one of Arizona’s last perennially flowing rivers, conservationists practice smart stewardship to minimize irrigation and clear invasive plants. Taking advantage of open areas in crowded cities, urban farmers are growing healthy foods and making profits. Studying iconic sandstone arches in the Southwest, researchers learn how these formations vibrate and gather data to help understand their architectural health.

From recent episodes of THIS AMERICAN LAND, these brief summaries of stories highlight major repair and maintenance issues affecting America’s national parks.

Commercial fishermen in the Gulf of Mexico are now using individual fishing quotas to manage their catches of red snapper, a fish population that has made a remarkable recovery after years of overfishing. With federal government support, landowners in Pennsylvania are managing their forests for diversity, providing better habitat for declining species of songbirds like the golden-winged warbler. In Georgia, a program on Lake Lanier for school kids teaches them the importance of water quality.