A greenhouse gas reduction target of 40% below 1990 levels for 2030 for the European Union, to be achieved within Europe, would not necessarily be sufficient for achieving the target of limiting global temperature increase to 2 °C, given a possible lack of comparable efforts by other countries.

Global emissions of CO2 increased by 3% last year, reaching an all-time high of 34 billion tonnes in 2011, according to this report released by European Commission. Top emitters contributing to this increase in CO2 are China, US, EU, India, the Russia & Japan.