The threat of global warming can still be greatly diminished if nations cut emissions of heat-trapping greenhouse gases by 70 percent this century, according to a new analysis.

The 2008 Super Tuesday tornado outbreak swept through several southern states and the lower Ohio Valley, killing 57 people. NCAR scientist Julie Demuth helped the National Weather Service assess the societal impacts of the deadly storms.

As part of its Walter Orr Roberts Distinguished Lecture series, UCAR will present a special lecture next week by NASA scientist James E. Hansen, one of the nation's most respected experts on climate change.

Geoffrey Tyndall, NCAR's Atmospheric Chemistry Division • As a physical chemist, Tyndall likes "quantifying things, putting numbers on them—how fast does this go, and why is this reaction faster than that one?"

Volunteers across the country are welcoming spring by taking part in a nationwide initiative, known as Project BudBurst, to track climate change by recording the timing of flowers and foliage.