The Irish potato famine that caused mass starvation and approximately 1 million deaths in the mid-19th century was triggered by a newly identified strain of potato blight that has been christened "HERB-1," according to a new study.
A team has developed a model to determine the influences of humans and climate on vegetation changes. Valerie Smock explains what has the greatest effect.
The beginnings of Monday's (May 20) disastrous tornado in Oklahoma were caught from space by a weather satellite in orbit.
The scientists reported that global glaciers -- the ice bodies outside the Greenland and Antarctic ice sheets -- shed about 260 billion metric tons of meltwater annually during the six-year study period.