71.   According to the models, the buildup of heat-trapping greenhouse gases is largely responsible.

72.   According to this reasoning, the pattern produced by the combination of greenhouse gases and aerosols would be markedly different from that produced by any natural cause.

73.   After all, it seemed almost out of character for Bush to lead the charge on reducing greenhouse gases from utility generation.

74.   Alert serves as a base for Canadian research into greenhouse gases and Arctic bird migrations.

75.   All these factors are likely to increase emissions of greenhouse gases, produced largely through the use of fossil fuels like oil and coal.

76.   Both are considered greenhouse gases.

77.   Both companies say global warming is a problem and have endorsed the Kyoto agreement, a multilateral treaty aimed at limiting greenhouse gases.

78.   Buildings produce half of all greenhouse gases, the chemicals that are thought to cause global warming.

79.   Bush has refused to submit to international agreements like the Kyoto protocol on greenhouse gases, the small-arms control pact and other treaties.

80.   Bush said he would not seek to regulate the so-called greenhouse gas because, in part, the Clean Air Act does not consider carbon dioxide a pollutant.