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The San Pedro Riparian National Conservation Area in Arizona is a biodiversity hotspot. Bureau of Land Management

Conservation groups filed a lawsuit Thursday challenging the U.S. Army Corps of Engineers' approval of a permit that allows a huge master-planned sprawl development project near Benson, Arizona to proceed. The Villages at Vigneto would transform 12,167 acres of largely undeveloped habitat into 28,000 residences, 3 million square feet of commercial space, four golf courses, fountains, lakes and a resort.

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Rising temperatures and more frequent wildfires in Alaskan national parks could affect caribou's habitat and winter food sources. Zak Richter / NPS

By Stephen Nash

The Trump administration's decision to keep many U.S. national parks open during the current federal government shutdown, with few or no staff, spotlights how popular and how vulnerable these unique places are.

Some states, such as Utah and Arizona, have spent heavily to keep parks open rather than lose tourist revenues. Unfortunately, without rangers to enforce rules, some visitors have strewn garbage and vandalized scenic areas.

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Glen Canyon Dam, Colorado River. Sharon Mollerus, CC BY 2.0

By Tara Lohan

In the last few weeks of 2018, the Trump administration set the stage for a big battle over water in the new year. At stake is an important rule that defines which waters are protected under the Clean Water Act. The Trump administration seeks to roll back important protections for wetlands and waterways, which are important to drinking water and wildlife.

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Wind farm with solar panels in southern California. 4kodiak / E+ / Getty Images

By Jeff Deyette

Despite the Trump administration's ongoing attempts to prop up coal and undermine renewables—at FERC, EPA and through tariffs and the budget process—2018 should instead be remembered for the surge in momentum toward a clean energy economy. Here are nine storylines that caught my attention this past year and help illustrate the unstoppable advancement of renewable energy and other modern grid technologies.

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Democrat Kyrsten Sinema campaigning for Arizona Senate seat on Oct. 21. Bill Clark / CQ Roll Call / Getty Images

A little less than a week after the midterm election, Democrat Kyrsten Sinema has edged out Republican Martha McSally to become Arizona's first female Senator and the first openly bisexual member of Congress, The Guardian reported. She is the first Democrat to win an Arizona Senate seat since 1976.

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With her win, Alexandria Ocasio-Cortez became one of four Democrats heading to Congress to push for a Green New Deal. Rick Loomis / Getty Images

Results from the U.S. midterm election are mostly in, and, when it comes to what they mean for the environment, they're a real mixed bag.

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