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Oklahoma is home to bison who roam freely on the last stretches of open prairie. Once a year, the bison are rounded up, vaccinated and de-wormed. It's part of the effort to bring back the herds.

The storm dumped freezing rain from Texas all the way to Iowa. Authorities in Kansas reported several deaths due to car accidents and flooding claimed three lives in Texas.

Protesters gathered on the eve of a global conference on climate change. About 200 activists defied a ban on mass demonstrations and they were met by riot police.

The Pope preached reconciliation Sunday in Central African Republic, a country that has seen clashes between Christian and Muslim militias.

Bernie Krause is an audio ecologist. This year he noticed a precipitous drop in the sounds of one his favorite field recording sites, a change he attributes in large part to California's drought.

The 1997 Kyoto treaty set targets for cutting greenhouse gas emissions that many nations didn't meet. This time, stakes are higher and all countries will be asked to set and meet their own limits.

The conference is being billed as a last-chance summit to avoid catastrophic climate change. The goal is to come to a global agreement to limit greenhouse emissions.

Turkish Prime Minister Ahmet Davutoglu said his country was defending its airspace. "Protection of Turkish airspace, Turkish borders is a national duty," Davutoglu said.

In the city, many residents want accountability from this trial. They're eager for convictions, and some fear there will be more unrest if that doesn't happen.

The "brandalists," as they call themselves, used commercial ad space to point out the damage they say big corporations are having on the world's environment.