Corals 'bleach' when they are under stress, which typically has been caused by an increase in sea-surface temperatures (but which could be also brought on by variations in light, carbon dioxide (CO2) levels or pollutants).

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You could get very ill from bacterial contamination or other pollutants that often and easily end up in airplane food.

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Consumers can reduce the amount of water through direct action - by applying a water-saving showerhead, shutting off the tap during teeth brushing, by not disposing of medicines, paints or other pollutants down the sink etc.

UNESCO: MEDIA SERVICES

The authors also did not control for smoking in the home or for indoor pollutants, although they did control for maternal smoking.

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Evidence of oxidative stress can appear under other conditions, including exposure to certain environmental pollutants or infections in the urinary genital tract.

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The operator should use an independent risk evaluator for weather and other environmental conditions like volcanic ash or even heavy pollutants which can effect helicopter operation and pilot visibility.

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And they sometimes provide an informal whistle-blowing channel where a blatant abuse of workers' rights or an excessive discharge of pollutants is taking place.

ECONOMIST: Company goods

More fascinating, less dirty - Dyson now engineers motors in a room so clean no pollutants, pollen or dirt can damage the finely tuned technology being made by the highly calibrated production line.

BBC: Technology

They left no pollutants, damaging poisons or nuclear waste.

BBC: VIEWPOINT

But in the short term, researchers are working on reformers which produce hydrogen aboard vehicles by extracting the gas from methanol or other hydrocarbon fuels -- a process that can release pollutants, though at far lower levels than internal combustion engines, Roan said.

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And although activated charcoal is not at all efficient in chemically trapping (or adsorbing) methane, it will readily grab onto carbon dioxide and other pollutants.

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But carbon is different from other pollutants, he notes, saying that it is globally released and action by one state or one region will have little affect.

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The pollutants that the scientists focused on were compounds containing carbon and halogens - fluorine, chlorine, bromine or iodine.

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