1. NOAA. State of the Climate: Global Analysis for December 2014. National Climatic Data Center. Available from: 〈http://www.ncdc.noaa.gov/sotc/global/2014/12〉; 2015 [accessed 19.01.15].
2. NASA. NASA, NOAA Find 2014 Warmest Year in Modern Record. National Aeronautic and Spatial Agency, Available from: 〈http://www.nasa.gov/press/2015/january/nasa-determines-2014-warmest-year-in-modern-record/index.html#.VLyjeUeUeSq〉; 2015 [accessed 19.01.15]
3. Climate change 2013: the physical science basis;IPCC,2013
4. Climate change 2014: mitigation of climate change;IPCC,2014
5. World energy outlook 2012;IEA,2012