EU environment ministers are due to meet in Luxembourg to try to agree a joint position on climate change.
Fossil fuel burning is one of the biggest sources of CO2 emissions
The talks are a precursor to next month's UN climate change summit in Canada on launching a global approach to cutting pollution post-2012.
The EU is seen as having taken a lead in proposing a new regime of future cuts in carbon dioxide (CO2) emissions.
Under the 1997 Kyoto accord, the EU is obliged to reduce CO2 emissions by 8%, from 1990 levels, by 2012.
In June, EU leaders endorsed plans to bring the level of emissions down to between 15 and 30% below 1990 rates, by 2020.
However, they shelved a plan to bring CO2 to 60-80% by 2050, saying that the issue would be kept "under review".
The latest draft proposal envisages reductions between 15-50% by 2050 compared to 1990 levels.
The 25-member bloc is keen to bring the US - which has refused to join the Kyoto protocol - on board in a new climate change pact.
Washington has not ratified the protocol, saying it would it would gravely damage its economy.