The United States is a far bigger country with far greater emissions than the United Kingdom, so any emissions cuts it makes will have a bigger impact globally. However, it is one thing to announce targets and another thing to meet them.
In November 2008, the UK passed legislation that it would reduce emissions by 80% by 2050 in a bill called the Climate Change Act.
The United States most recently proposed a new standard that Obama brought to the table in Copenhagen. Working from greenhouse gas levels in 2005, he suggested that the U.S. could reduce emissions 17% below the level in 2005 by 2020 and 83% by 2050. The House supported these targets by passing the bill in June but the Senate has not yet made that move. This is a bold and necessary bill that could come about by next year, but it needs to be passed and then it needs to be fulfilled. So, to answer your question, the United States is proposing more stringent emission cuts by 2050, which will have a greater impact than the UK anyway since the US emits so much more.
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