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The smoke from wildfires can have harmful effects on human health, especially for children, seniors, and the chronically ill.

"At the rim of the Arctic Circle in Canada, gold mining firm Agnico-Eagle is learning how tough it is to operate in a remote region with temptingly large, but frustratingly inaccessible, reserves of oil, gas and minerals. Commentators rarely mention nightmarish logistics, polar bears and steel-snapping cold when they confidently predict that as the Arctic warms up, melting sea ice and shorter winters will open up the expanse to exploration."

"Tropical Storm Katia, which lost its Category 1 hurricane charateristics Thursday evening, is not expected to strengthen much on Friday, the U.S. National Hurricane Center said in its latest report. "

"Record-breaking triple-digit temperatures were prolonging a devastating drought that has been baking the South and the dry spell could extend into next year and beyond, climate experts said on Thursday."

"HONG KONG — The bankruptcies of three American solar power companies in the last month, including Solyndra of California on Wednesday, have left China’s industry with a dominant sales position — almost three-fifths of the world’s production capacity — and rapidly declining costs."

"A new study says firefighters who toiled in the wreckage of the World Trade Center in 2001 were 19 percent more likely to develop cancer than those who were not there, the strongest evidence to date of a possible link between work at ground zero and cancer."