On Capitol Hill, Democratic Congress members Henry Waxman of California and Edward Markey of Massachusetts have introduced a measure to reduce US emissions of greenhouse gas. The measure exceeds President Obama’s proposals for emissions cuts, seeking a 20 percent reduction below 2005 levels by 2020, compared to Obama’s 14 percent. It would also impose stricter efficiency standards and require that the US draw a quarter of its electricity from renewable sources by 2025.