Nepal says its tiger population has almost doubled from 2009

Blue bird from 'Rio' movie now extinct in the wild

Kansas environmentalists decry order on injection wells

VIDEO: Bulldozer triggers large, green pollen cloud

More than 2K injection wells improperly permitted in Kansas

Arkansas River Trash Roundup this weekend

Oklahoma orders cut in water injection after more than a dozen earthquakes

Magnitude 3.3 earthquake reported near Anthony

Kansans feel Oklahoma earthquake

4.1-magnitude earthquake strikes Oklahoma

Tyson fined $2 M for causing Missouri fish kill

Magnitude 3.1 earthquake shakes north-central Oklahoma

Dunkin' Donuts to stop using foam cups by 2020

When to watch the 'super blue blood' moon

First and only supermoon of 2017 happens this Sunday

Keystone pipeline leaks 210K gallons of oil in South Dakota

Planned chemical biological warfare tests in Okla. sparks protest

UN agency: CO2 concentrations grew at record rate in 2016

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