Now, with the clean air brought by anti-pollution legislation, British peppered moths are once again peppered.

ECONOMIST: Pollution and evolution

The White House also knows BP is currently operating under the Oil Pollution Act, a piece of legislation passed in 1990 by a Democratic Congress.

WSJ: Obama's Political Oil Fund

Meanwhile, Republicans in the House of Representatives said last week that they planned to introduce legislation that would delay the pollution rules for utilities.

FORBES: Utilities Resist New Toxic Emissions Regulations

Under the island's pollution laws had the spill actually caused harmful pollution to the water supply then there would have been a case for legal action, but there is also legislation covering cases where an incident might have potentially caused harmful pollution, even if it actually did not.

BBC: Guernsey

Few countries have adopted legislation to reduce land-based marine pollution, leading to an increase in the number of dead ocean areas.

UNESCO: Social and Human Sciences

Dr Frank Kelly, professor of environmental health at London's King's College, said legislation worked in the 1950s to deal with pollution but new laws were needed now.

BBC: News, London

So I ask this Congress to send me legislation that places a market-based cap on carbon pollution and drives the production of more renewable energy in America.

CNN: Obama speech to Congress focuses on economy

Americans for Prosperity has held at least eighty events targeting cap-and-trade legislation, which is aimed at making industries pay for the air pollution that they create.

NEWYORKER: Covert Operations