Guardian: Europe is inadvertently undermining President Obama on global warming, with potentially damaging consequences for climate co-operation and transatlantic relations. Consider these troubling developments. First, many European policymakers have unrealistic expectations about how quickly Obama can reduce US emissions. Europe expects all developed countries to cut their emissions to 25-40% below 1990 levels by 2020. This may be reasonable for Europe, which expects to be 8% below 1990 …