Tens of thousands of walruses have been forced to gather on shore because there isn't enough sea ice to sustain them, according to NOAA and the USGS.
First Ebola case confirmed in the U.S.
A patient at a Texas hospital has tested positive for Ebola virus.
Waterlogged Saskatchewan: 700 mm of rain
Too much rain at the wrong time can be challenging for farmers.
Volcano science: What happened at Mt. Ontake?
A look at what it's like to get caught in an advancing volcanic ash cloud!