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An icy rain fell on North Texas Sunday, and scores of school districts were closed Monday. Scores of motorists were stuck on icy highways to the east and…

Scientists who study the remote, rugged continent at the bottom of the world are on edge as funding for research there remains in jeopardy. It hasn't been decided yet if Antarctic operations for the research season will be allowed to continue.

Engineers dynamited the massive Crown Point Bridge that links Vermont and New York across Lake Champlain on Monday. The 80-year-old bridge was closed without warning last fall because of safety concerns. Its destruction punctuates a major transportation crisis that has worsened as the lake begins to ice up, forcing motorists to make 100-mile detours. A new bridge is expected to open in 2011.

Container giant Maersk will send one of its ships through the Arctic on the Northern Sea Route to test its feasibility as a new, time-saving shipping lane.

Greenhouse gas concentrations reached a record high. Global sea level was the highest on record, too. NOAA's State of the Climate report points to the urgency of addressing climate change.

Climate change is opening up the Arctic to luxury cruises, including an Alaska-to-New York voyage. The vacation destination takes advantage of warming oceans but raises safety and ethical concerns.

The far reaches of Antarctica are no longer visited only by scientists and their support staff. Adventure tourists and curiosity seekers from Europe, North America and beyond now come by the boatful — and they're bringing some souvenirs from home. Ecologist Steven Chown tells Robert Siegel that visitors unknowingly carry seeds on their clothes and bags. He says they've helped spread dozens of invasive plant species on the continent and risk permanently changing Antarctica's ecology.

Of the 680 people arrested, around three-quarters had convictions, Homeland Secretary John Kelly said. Advocacy groups report that the raids also swept up people with no criminal record at all.

Immigration authorities have detained 506 pregnant women since December, when the Trump administration ended a policy to release most pregnant women while their immigration cases are pending.

The Trump administration is withdrawing hundreds of thousands of dollars in fines against some immigrants in the country illegally who have sought refuge in churches.