Tom thought it would be far better to prevent pollution than clean up a river after it had been poisoned.

FORBES: Magazine Article

If successful, controls would be put in place to prevent light pollution.

BBC: Dark sky protection bid for Northumberland

Intensive development of agriculture and industry may become a reason of deterioration of underground water in various regions in the absence of water-protective measures which can prevent its pollution.

UNESCO: OFFICE IN TASHKENT

What makes this prosecution particularly senseless is that the Safe Drinking Water Act was adopted to prevent the pollution of water supplies, yet the evidence at trial convincingly demonstrated (and the trial judge so held) that the water King injected into his irrigation wells contained absolutely no contaminants.

FORBES: U.S. v. King: It��s Time for Some Prosecutorial Restraint

When we put in place new common-sense rules to reduce air pollution, like we did in December, it was to prevent our kids from breathing in dangerous chemicals.

WHITEHOUSE: President Obama Speaks at Conference on Conservation

But the real fury was soon aimed at the central government, accused not just of early decisions that had spread the pollution much more widely than need be, but of having neither the will nor the equipment to prevent the oil reaching land, nor the real complaint to clean up when it did.

ECONOMIST: The Prestige oil spill