The long-term rise in global temperatures, the dominant cause of which is the anthropogenic emission of greenhouse gases, combined with the effects of a developing El Niño, have resulted in unusual global warmth in 2015. The global-average near-surface temperature for 2015 is likely to be the warmest on record according to data sources analysed by the WMO. A preliminary estimate based on data from January to October shows that the global average temperature for the year so far was around 0.73 ± 0.09°C above the 1961-1990 average of 14.0°C and approximately 1°C above the 1850-1899 period, although uncertainties relative to this earlier period are larger and more difficult to estimate.
Links:
[1] http://admin.indiaenvironmentportal.org.in/reports-documents/provisional-annual-statement-status-global-climate-2015
[2] http://admin.indiaenvironmentportal.org.in/category/publisher/world-meteorological-organization
[3] http://admin.indiaenvironmentportal.org.in/category/thesaurus/climate
[4] http://admin.indiaenvironmentportal.org.in/category/thesaurus/climate-change
[5] http://admin.indiaenvironmentportal.org.in/category/thesaurus/el-nino
[6] http://admin.indiaenvironmentportal.org.in/category/thesaurus/sea-level-rise
[7] http://admin.indiaenvironmentportal.org.in/category/thesaurus/heat-waves
[8] http://admin.indiaenvironmentportal.org.in/category/thesaurus/droughts
[9] http://admin.indiaenvironmentportal.org.in/category/thesaurus/rainfall
[10] http://admin.indiaenvironmentportal.org.in/category/thesaurus/storms
[11] http://admin.indiaenvironmentportal.org.in/category/thesaurus/green-house-gases
[12] http://admin.indiaenvironmentportal.org.in/category/thesaurus/ozone
[13] http://admin.indiaenvironmentportal.org.in/category/thesaurus/africa
[14] http://admin.indiaenvironmentportal.org.in/category/thesaurus/asia
[15] http://admin.indiaenvironmentportal.org.in/category/thesaurus/south-america
[16] http://admin.indiaenvironmentportal.org.in/category/thesaurus/n-c-america
[17] http://admin.indiaenvironmentportal.org.in/category/thesaurus/europe
[18] http://admin.indiaenvironmentportal.org.in/category/thesaurus/extreme-weather-events