biological diversity

A Millennial Land Ethic: Or What Would Leopold Do Today?

A Millennial Land Ethic: Or What Would Leopold Do Today?

In the mid-1940s, American conservationist and wildlife biologist Aldo Leopold articulated his now-famous land ethic statement, “A thing is right when it tends to preserve the integrity, stability, and beauty of the biotic community.

Rewilding the shortgrass prairie

 Rewilding the shortgrass prairie

Before European settlers came to North America, bison migrations were essential to the annual renewal of shortgrass prairie ecosystems, says EarthWatch chief scientist Cristina Eisenberg. By nipping off grasses, fixing nitrogen in the soil, and churning up the earth, their passage kept grasslands across parts of Montana, Wyoming, Colorado and Idaho functioning smoothly. 

TEK and the Return of Wolves, Fire, and Bison

TEK and the Return of Wolves, Fire, and Bison

Traditional Ecological Knowledge (TEK) is the wisdom indigenous and local people acquire by living on the earth. Rooted in a specific landscape and based on the fact that everything is connected, TEK braids together relationships between plants, animals, the earth, the seasons, and people.

Are Large Carnivores Doomed by Climate Change?

 Are Large Carnivores Doomed by Climate Change?

he world is getting warmer, creating an extinction threat for many species. According to NASA, since 1880 the Earth’s global temperature has risen by nearly one degree Celsius.

Recovery of the Great Bear?

 Recovery of the Great Bear?

As was the case for other large carnivores in the lower 48 United States, by the 1960s grizzly bears were nearly extinct. This species had dropped to less than 2 percent of its former range south of Canada and occurred in six small, discrete populations, totaling 800-1,000 individuals.

Endangered Species Act Caught in Congressional Crosshairs

 Endangered Species Act Caught in Congressional Crosshairs

The most powerful environmental law on Earth, the Endangered Species Act (ESA), is under the gravest assault it has ever faced. Last week I spent time in Washington, DC briefing US congressional leaders on ESA threats and brainstorming about how to safeguard this venerable law.