"The White House recently modified an Environmental Protection Agency proposal to limit soot emissions, according to documents obtained by The Washington Post, inviting public comment on a slightly weaker standard than the agency had originally sought."

"A resin in the most commonly used white composite dental fillings may be linked to subtle neuropsychological deficits in children."

"CALEXICO, CALIF. — As the relentless wind stirs up piles of dust and dirt and creates a gigantic funnel of haze in the vast, sweltering Imperial Valley, children like Marco Cisneros battle to breathe."

"As the climate has warmed during the past several decades, there has been a growing imbalance between record daily high temperatures in the contiguous U.S. and record daily lows. A study published in 2009 found that rather than a 1-to-1 ratio, as would be expected if the climate were not warming, the ratio has been closer to 2-to-1 in favor of warm temperature records during the past decade (2000-2009). This finding cannot be explained by natural climate variability alone, the study found, and is instead consistent with global warming."