Fracking
The Democratic presidential candidates have divergent views on the controversial natural gas drilling technique.
Will "No fracking anywhere" message help differentiate him from Hillary Clinton in the New York primary?
WHAT'S HAPPENING
Companies may be forced to reduce production to comply.
New research reveals fracking involves hundreds of toxins that may pose serious ills and many more that remain unstudied.
The state has become a quake capital of the world.
Oklahoma now has more quakes than anywhere in the world.
"The TPP poses a panoply of threats to our climate and environment."
The governor has said he doesn't support a statewide ban on the controversial practice.