101.   But the United States is by far the biggest producer of greenhouse gases, both per capita and in total.

102.   But there was now the prospect of a new push in Washington on action to curb greenhouse gases, they said.

103.   But the Kyoto pact supporters were disappointed that the report concludes nothing can be done about the environmental impact of decades of greenhouse gases already in the atmosphere.

104.   But the United States has refused to participate in the Kyoto Protocol, an international treaty that calls for the mandatory reduction of greenhouse gases by industrial nations.

105.   But whether it represents yet another sign of global warming due to world-wide emissions of greenhouse gases, the scientists are not so sure.

106.   Carbon dioxide is by far the most abundant greenhouse gas in the atmosphere.

107.   Carbon dioxide is the largest single factor among greenhouse gases that trap solar energy.

108.   Carbon dioxide is considered a greenhouse gas.

109.   California regulators say that reducing emissions of greenhouse gases is not their problem, and should be handled by the federal Environmental Protection Agency.

110.   China is already the number-two producer of greenhouse gases, and may soon overtake America.