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It took nearly a decade, but former EPA scientist Dominic DiGiulio has proved that fracking has polluted groundwater in Wyoming

It took nearly a decade, but former EPA scientist Dominic DiGiulio has proved that fracking has polluted groundwater in Wyoming

Climate change, agriculture and food security

Climate change, agriculture and food security

"I Have a Dream" is a 17-minute public speech by Martin Luther King, Jr. delivered on August 28, 1963, in which he called for racial equality and an end to discrimination.

"I Have a Dream" is a 17-minute public speech by Martin Luther King, Jr. delivered on August 28, 1963, in which he called for racial equality and an end to discrimination.

REAL + FREE EDUCATION... This organization still BLOWS my mind! So pumped. So encouraged. >> Khan Academy’s 100&Change proposal: World-class diplomas for anyone, anywhere - YouTube

REAL + FREE EDUCATION... This organization still BLOWS my mind! So pumped. So encouraged. >> Khan Academy’s 100&Change proposal: World-class diplomas for anyone, anywhere - YouTube

Stephen Linaweaver has been kayaking from Oakland, Calif., to work in San Francisco for four years.

Forget The Car Keys — This Commute Requires A Paddle

Stephen Linaweaver has been kayaking from Oakland, Calif., to work in San Francisco for four years.

A cereal rye cover crop grows (at left) in a field where corn was recently harvested. Cover crops can capture nutrients such as nitrate and prevent them from polluting nearby streams.

Here's How To End Iowa's Great Nitrate Fight

A cereal rye cover crop grows (at left) in a field where corn was recently harvested. Cover crops can capture nutrients such as nitrate and prevent them from polluting nearby streams.

United Nations members have reached an agreement on how countries should tackle climate change.

UN members agree deal at Lima climate talks

United Nations members have reached an agreement on how countries should tackle climate change.

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