51.   Bush clean air laws will reduce air pollution more than a quarter million tons a year.

52.   But a number of laws are reducing light pollution, and lighting engineers are finding that streetlights with baffles to aim all their light downward use less power.

53.   But environmentalists say that there are now less expensive, less complex ways to reduce such pollution than adding ethanol.

54.   But environmental groups said the new plan would do little to reduce air pollution, and they warned that the EPA was likely to reject it.

55.   But some critics wonder why the same governor who now is forcing automakers to sell thousands of electric cars to reduce pollution chose a Navigator.

56.   But opponents say the project will do little to ease congestion or to reduce air pollution but will instead benefit conventioneers and downtown developers.

57.   But under the system, Plant A is allowed to reduce its pollution by two tons and sell Plant B the right to emit the second ton.

58.   By giving everyone a pecuniary incentive to reduce overall pollution, the act also makes it highly profitable to innovate.

59.   Car manufacturers and the government are working together to create new technologies that will reduce air pollution and keep American cars competitive in the global market.

60.   Catalytic converters are used to reduce pollution from emissions as required under legislation in Europe and North America.