Researchers now know the difference half a degree can make.
Links:
[1] http://admin.indiaenvironmentportal.org.in/news/half-degree-warmer-means-lot
[2] http://admin.indiaenvironmentportal.org.in/category/newspaper/eco-business
[3] http://admin.indiaenvironmentportal.org.in/category/thesaurus/climate-change
[4] http://admin.indiaenvironmentportal.org.in/category/thesaurus/global-warming
[5] http://admin.indiaenvironmentportal.org.in/category/thesaurus/scientists
[6] http://admin.indiaenvironmentportal.org.in/category/thesaurus/rainfall
[7] http://admin.indiaenvironmentportal.org.in/category/thesaurus/extreme-weather-events
[8] http://admin.indiaenvironmentportal.org.in/category/thesaurus/agriculture