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March is when oil equipment starts using ice roads on the Alaskan North Slope. It's also when polar bears and cubs emerge from dens. Aerial spotters find dens so roads and workers can bypass bears.

There's a new, invasive species threatening Florida wildlife in the Everglades. It's the Argentine black and white tegu, which can grow to more than five feet and has teeth.

Hillary Clinton joins the exclusive club of men who reached for, but failed to grasp, our nation's highest elected office. From Aaron Burr to Al Gore, here's a look at the company Clinton joins.

Ted Kolderie, often called the "godfather" of the charter school movement, has a new book out. He says the lack of innovation in how teachers teach and students learn is stifling school reform.

Economists call it the social cost of carbon. A single number that is supposed to reflect all of the costs society incurs when people burn fossil fuels. That number is now part of federal regulations, and some industries aren't happy.

Rising sea levels put extra pressure on coastal bedrock in South Florida. Eventually, as seawater moves in, it could contaminate plants on the surface and the region's stores of freshwater beneath.

Pope Francis canonized the United States' first saint, Junipero Serra, on Wednesday. The controversial Spanish missionary founded Catholic missions in California in the 18th century.

Even U.S. companies that don't have close ties with China have to be concerned with its slowing growth. When China buys fewer goods and commodities, prices fall for producers everywhere.

There are more Catholic Republicans than ever running for president, but not all have embraced Pope Francis' more liberal statements and theology.

In the past decade, the Gulf of Maine warmed faster than 99.9 percent of the global ocean. The rapid warming explains why recent fishing policies failed to rebuild the cod population, a study finds.