Destructive tornadoes rip through Dallas-Fort Worth

Amazing video from at least two separate large and destructive tornadoes in the Dallas-Fort Worth area earlier today.

Earthquake in Oaxaca felt in Mexico City

In Mexico City, people reportedly streamed out of office buildings as the earthquake was occurring. There are no initial reports of injuries or damages.

Solar eclipses have an effect on wind

Dr. Suzanne Gray said solar eclipses don't just turn the lights out - they also make the wind slow down and change direction.

Narwhals display sophisticated sword fighting techniques

No one has ever observed behavior of narwhals at depths so deep that sunlight never penetrates. Until now.

West Antarctic ice shelves tearing apart at the seams

Floating ice shelves in West Antarctica are losing their grip on adjacent bay walls, which could amplify an already accelerating loss of ice to the sea.

Arctic sea ice hits its maximum extent for 2012

The maximum extent of Arctic sea ice during 2012 was the ninth lowest in the satellite record. Sea ice extent is a major marker for global warming.

Final issues statement from Planet Under Pressure conference, London, 2012

The Planet Under Pressure conference in London ended today. Read the final conference statement from the four-day conference here.

Is herpes virus killing coral?

Researchers say viral disease - particularly herpes - might have a role in the worldwide decline of coral. Several factors are currently killing coral.

Hail in the U.S. in March 2012

This March, we in the U.S. have seen some dynamic storms produce large and copious amounts of hail. How hail forms and some great images.

Severely ill dolphins sickened by Gulf oil spill?

Severely ill dolphins in the Gulf of Mexico dolphins saw heavy, prolonged exposure to oil in the Deepwater Horizon spill.