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So what can be done to stop these wildfires ravaging the Amazon? That is a question that's being asked by everyone from world leaders to protesters on the streets of Rio de Janeiro.

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The company behind the controversial Keystone XL pipeline has won a major victory in Nebraska, where environmental activists, two Native American tribes and some local landowners had sought to derail its construction. The state's Supreme Court on Friday ruled unanimously in favor of an alternate route proposed by TC Energy, formerly known as TransCanada.

International concern is growing over the rapidly spreading fires that are destroying large swaths of the Amazon rainforest.

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The Amazon rainforest is sometimes called the lungs of the planet because it produces an estimated 20% of the oxygen in this planet's atmosphere.

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An audit of the federal system that fines mining companies for unsafe conditions found no evidence that more than $1 billion in mine safety penalties over 18 years deterred unsafe mining practices.

The four-year long audit from the Office of Inspector General of the Labor Department says its analysis of Mine Safety and Health Administration accident and violations data "showed no correlation between penalties paid and the safety of mine operations."

Updated at 2:42 p.m. ET

Democratic National Committee officials rejected a proposal Thursday to hold a presidential primary debate focused only on climate change.

After the party's resolutions committee voted down the proposal, members of the activist group Sunrise Movement interrupted the meeting by standing on their chairs and singing a version of the song "Which Side Are You On?" They then walked out.

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