Human activity produces more CO2 in three to five days than all volcanoes produce in a year, according to study. Read more about CO2 from human activity.
Study shows how two highly intelligent bird species, parrots and crows, use native talents to inform their decisions. Read more about these smart birds.
By Friday evening, June 10, the Wallow fire in Arizona had burned nearly 409,000 acres. Three images taken from space show the fierce magnitude of this event.
The jagged edge of a shark's dorsal fin is unique -- like a human fingerprint -- and was a key characteristic in allowing researchers to count one population.
Coolest summers may be hotter than the hottest summers of the past 50 years for many areas of the globe if greenhouse gases continue to rise, study shows.
Think about stirring your morning coffee and the liquid spinning, then imagine that happening on an oceanic scale. Voila! An ocean gyre. Read about ocean gyres.