Global carbon-dioxide (CO2) emissions from fossil-fuel combustion reached a record high of 31.6 gigatonnes (Gt) in 2011, according to preliminary estimates from the International Energy Agency (IEA).
This represents an increase of 1.0 Gt on 2010, or 3.2%. Coal accounted for 45% of total energy-related CO2 emissions in 2011, followed by oil (35%) and natural gas (20%).
The 450 Scenario of the IEA’s World Energy Outlook 2011, which sets out an energy pathway consistent with a 50% chance of limiting the increase in the average global temperature to 2°C, requires CO2 emissions to peak at 32.6 Gt no later than 2017, i.e. just 1.0 Gt above 2011 levels. The 450 Scenario sees a decoupling of CO2 emissions from global GDP, but much still needs to be done to reach that goal as the rate of growth in CO2 emissions in 2011 exceeded that of global GDP.
In 2011, a 6.1% increase in CO2 emissions in countries outside the OECD was only partly offset by a 0.6% reduction in emissions inside the OECD. China made the largest contribution to the global increase, with its emissions rising by 720 million tonnes (Mt), or 9.3%, primarily due to higher coal consumption. “What China has done over such a short period of time to improve energy efficiency and deploy clean energy is already paying major dividends to the global environment”, said IEA Chief Economist Fatih Birol. China’s carbon intensity — the amount of CO2 emitted per unit of GDP — fell by 15% between 2005 and 2011. Had these gains not been made, China’s CO2 emissions in 2011 would have been higher by 1.5 Gt.
