Global warming of more than 2°C would have serious consequences, such as an increase in the number of extreme climate events.
– IPCC InterGovermental Panel on Climate Change-
The study suggests that current atmospheric greenhouse gases levels may commit the planet to 3–7°C of future warming.
-Nature-
http://www.nature.com/news/longest-historic-temperature-record-stretches-back-2-million-years
