Over the next two years, Hong Kong plans to burn 28 tons of ivory. Many conservationists hope destroying stockpiles will dampen demand in a country where many wealthy Chinese are buying ivory statues and carvings as investments. Others worry that it may have no effect at all.

A new study co-authored by a Butler professor says urbanization is not necessarily a negative for biodiversity. Rebecca Dolan says there are sometimes misconceptions in how cities are viewed when it comes to fostering life for birds and plants.

The Sierra Club says a new report is another example of why an Indianapolis power plant should shut down. The U.S Environmental Protection Agency finds 88 percent of toxic industrial pollution in Marion County comes from Indianapolis Power and Light's Harding Street Power Plant.

The dredging operation is part of a plan to expand a coal port in Queensland. Environmentalists have warned that dumping sediment could kill off delicate corals, but park officials said dredging would be "subject to strict environmental conditions."

The Vice President of Citizens Energy's Water Operations says it's unlikely a chemical spill here would have the same impact as the one in West Virginia. Lindsay Lindgren says there are multiple treatments plants that can be used to bypass shutdowns and modify flow.

Marijuana cultivation is booming along the state's North Coast. But these plantations, critics say, guzzle enormous amounts of water while also spilling pesticides and fertilizers into waterways that are important sources of the West Coast's salmon species.

Namibian officials issue five permits per year to hunt the endangered animal. For the first time, one was auctioned off outside that country. Proceeds will go toward conservation of the herd. But critics say it's not right to kill one animal in a bid to save others.

Two-dozen endangered horses were brought to an unfenced area of western Spain that's believed to have once been native territory for them.

More than 80 percent of the seafood consumed in the U.S. now comes from abroad. And fishermen in other parts of the world continue to kill not just dolphins but seals and even whales. So conservation groups are calling for tougher import rules to protect sea animals at risk from fishing.

Decades ago, amid fears of rapid population growth, a biologist and an economist made a bet about how many people the planet could sustain. Global population is now estimated to top 7.1 billion. So who won the famous bet?