BOULDER, Colo., Feb. 25 (UPI) -- University of Colorado-Boulder scientists said western U.S. states have become 500 percent dustier during the past two centuries because of human activity.

PHOENIX, April 6 (UPI) -- The new report on climate change says rising temperatures may create conditions not seen in Arizona and the Southwest since the 1930s Dust Bowl.

BOULDER, Colo., March 23 (UPI) -- National Center for Atmospheric Research and University of Arizona scientists say Arctic-Antarctic ice may melt more quickly than expected this century.

TUCSON, Aug. 23 (UPI) -- The Arctic Ocean may reportedly become seasonally ice-free for the first time in more than a million years if the current warming trends are not halted.

BOULDER, Colo., April 4 (UPI) -- A series by UPI examining the potential impact of global climate change. This week: There is a broad spectrum of interpretations of the science behind global climate change.

BOULDER, Colo., Jan. 10 (UPI) -- A series by UPI examining the emerging impacts of global climate change. This week: The Arctic may be undergoing a transition in its vegetation thanks to global warming.

LOS ANGELES, Oct. 25 (UPI) -- A series by UPI examining global climate change. This week: The southwestern United States has been in the grip of a drought that might be a record-setter -- depending upon how one interprets the numbers. The phenomenon no doubt will help fuel the argume

BOULDER, Colo., Oct. 20 (UPI) -- A series by UPI examining humanity's relationship to the environment. This week: Amphibians might be the latest candidates to play the role of canaries in the coal mine, because they are dying off at alarming rates.

A series by UPI examining the prospect of global climate change. This week: Climate change has a public relations problem. Despite the real and costly issues it raises, it is just the weather, after all, and people have had to handle the weather all of th