A US Environmental Protection Agency (EPA) official has said that the Obama administration is considering a carbon-trading system, if Congress doesn’t pass the cap-and-trade legislation that will allow companies to buy and sell the right to pollute. The existing Clean Air Act would enable the US to include emissions trading within agency regulations aimed at reducing carbon dioxide and other greenhouse gases, said Anna Marie Wood, a senior policy analyst at the EPA. Whilst the Agency “strongly prefers” that Congress pass the appropriate laws to deal with greenhouse gases, Wood stated that “there’s a lot of progress that can be made using certain tools under the Clean Air Act”.