Long term global goal. A global target, set at COP16 in Cancun in 2010, to reduce greenhouse gas emissions to a level where global average temperature rise is stabilized at below 2°C above pre-industrial levels. This would require limiting the concentration of GHGs in the atmosphere to about 450 parts per million carbon dioxide (CO2), based on the reccomendations of IPCCs 4th assessment report (AR4). Parties to the UNFCCC agreed on the review of the LTGG, taking into account the latest scientific evidence and assessing progress made to reach the 2 degrees goal, in the period 2013-2015 (see SED). In 2014, the UNEP Emissions Gap Report (2014) found that there is a need for additional reductions in emissions; between 8 and 10 billion tonnes of carbon dioxide equivalent (CO2e) by 2020.