Greenhouse gases naturally blanket the Earth and keep it about 33 degrees Celsius warmer than it would be without these gases in the atmosphere.
Links:
[1] http://admin.indiaenvironmentportal.org.in/news/reduce-greenhouse-gas-emissions
[2] http://admin.indiaenvironmentportal.org.in/category/newspaper/daily-star-bangladesh
[3] http://admin.indiaenvironmentportal.org.in/category/thesaurus/carbon-dioxide
[4] http://admin.indiaenvironmentportal.org.in/category/thesaurus/climate-change
[5] http://admin.indiaenvironmentportal.org.in/category/thesaurus/green-house-gases
[6] http://admin.indiaenvironmentportal.org.in/category/thesaurus/global-warming
[7] http://admin.indiaenvironmentportal.org.in/category/thesaurus/bangladesh