San Diego's Frozen Zoo Is Bringing Species Back from the Brink

The overpopulation of white-tailed deer is a conservation realization and an environmental disaster for the communities that harbor them. Hastings-on-Hudson, a progressive community, has opted for a humane birth control method PZP that is injected by darts into does. The method is successful for its non-lethal approach and the population growth has slowed, but as of yet has not significantly decreased.

Each year, close to three million dogs and cats are killed in shelters - in some cities more than 70 percent of the animals in shelters are euthanized. Target Zero is a program that works with fellow cities to spay and neuter animals and return them to the streets. Public complaints about animals have plummeted, and many shelters are well on their way to achieving a 'zero-kill' status.

Invasive weeds are ruining the habitat of New York's wild bog turtles. In Hudson River Valley, domestic goats and cows are being used to save bog turtles by grazing on this foreign weed. So far, the plan seems to be working as the turtles have shown signs of not just returning but also laying eggs in the area.

Growing wolf populations in Wyoming are forcing the U.S. Fish and Wildlife Service to make hard decisions about culling the endangered species in order to preserve local wildlife and livestock.

The fate of the Southeast's longleaf pine forests, and the endangered woodpeckers that depend on them, is in jeopardy. Fort Bragg, a station of the US military, is trying to save their local environment.

There are only five northern white rhinos left in existence - all in captivity and unable to breed. Researchers work to identify the most valuable solution to rhino poaching in order to prevent the animal from going extinct.

Wolves and ranchers have a long history of conflict. Today, wolves are back in Oregon, and ranchers are learning how to coexist with them, using an array of nonviolent techniques to protect both their herds and the predators.

Veterans who suffer from post traumatic stress disorder number about one-fourth of military personnel returning from Iraq and Afghanistan conflicts, roughly 500,000 veterans so far. Inmates in prisons nationwide train dogs as companions for these war veterans, providing a sense of healing for all.

A robust population of grizzly bears can be an indicator of healthy land; however, the bears also can destroy grain bins, consume vegetation, and kill livestock. Ranchers work with the Canadian government and local conservation groups to protect their resources with bear-proof grain bins and electric fences.

As a state with robust populations of wildlife, Montana has had its share of roadkill. Its Department of Transportation developed animal shelving, a type of wildlife crossing, to enable safe passage for small animals who need to cross the road. The measure, combined with other types of crossings, has reduced animal-vehicle collisions by half.