Definition of "greenhouse gas" []

• Any of the atmospheric gases that contribute to the greenhouse effect. (noun)

American Heritage(R) Dictionary of the English Language, Fifth Edition. Copyright (c) 2011 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

• "I have already endorsed a cap-and-trade system that would achieve real near-term reductions in greenhouse gas emissions and return America to a position of leadership so that we can secure an effective and equitable global solution to this crisis."
• "New Hampshire is already reducing its greenhouse gas pollution as part of the Regional Greenhouse Gas Initiative, and thanks to the leadership of Senator Martha Fuller Clark and Governor Lynch, you'll get 25% of your energy from renewable sources by 2025."
• "In its 2008 report Stop Trashing the Climate, GAIA explains that significantly decreasing the waste disposed of in landfills and incinerators will reduce greenhouse gas emissions the equivalent of closing one-fifth of U.S. coal-fired power plants.136"