High Quality Content by WIKIPEDIA articles! The America`s Climate Security Act of 2007 was a global warming bill that was considered by the United States Senate to reduce the amount of greenhouse gases emitted in the United States. Also known as the Lieberman-Warner bill, bill number S. 2191, the legislation was introduced by Sens. Joseph Lieberman (I-CT) and John Warner (R-VA) on October 18, 2007. The bill was appoved by the Senate Committee on Environment and Public Works in December 2007, and was debated in the Senate during the week of June 2. The bill would create a national cap-and-trade scheme for greenhouse gas emissions, in which polluters would mostly be allocated right-to-emit credits based on how much greenhouse gas they currently emit. The cap would get tighter over time, until by 2050, emissions would be reduced to 63% below 2005 levels. Several environmental groups express their encouragement at the progress in legislation on the global warming issue while at the same time expressing disappointment that the bill doesn`t reduce emissions enough. On June 6, 2008, the bill was killed by Senate Republicans over worries that it would damage the economy.