So the heat and humidity, the pollution all combined as one.

NPR: Beijing Air Quality to Challenge Olympic Athletes

That, combined with warmer waters, pollution and policies that protect natural predators like seals, have all contributed to fewer fish that triggered the mandatory cuts.

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Unless action is taken now, the consequences of our activities are at a high risk of causing, through the combined effects of climate change, overexploitation, pollution and habitat loss, the next globally significant extinction event in the ocean.

FORBES: A Call to Arms on Climate Change

This river and rain runoff, combined with strong onshore winds, has led to high levels of sea pollution.

BBC: Where to go while Biarritz battles beach pollution

The American Lung Association's study ranks the air quality of 900 counties and more than 200 U.S. Census-defined Metropolitan Statistical Areas and Combined Statistical Areas--cities and their surrounding suburbs--where an air pollution monitor is present.

FORBES: Magazine Article

The 2011 study offers an intensive analysis of air pollution in more than 900 counties and more than 200 Metropolitan Statistical Areas (MSA) and Combined Statistical Areas (CSA), or cities and their surrounding suburbs.

FORBES: List: America's Most Polluted Cities