The two degrees above pre-industrial level temperature target which is established by the 1970 studies have been in talks in the Copenhagen Agreement and the Stern review during the 2009 United Nations Climate Change Conference.
At the previous United Nations Framework Convention on Climate Change convened in Lima, Peru in December, 2014, scientist were doubtful regarding the two degree Celsius mark, and some of the scientist recommended to lower the mark to 1.5 degree Celsius or even lower because this may be insufficient.
The two degree mark guides the changes in heat waves, rise in sea level, weather outlines, deluges, dry spells, other natural calamities, in the hike peak areas and the Polar Regions.
Petra Tschakert, a professor at Penn State University and a lead author of the report for the UN’s Intergovernmental Panel on Climate Change said, “A low temperature target is the best bet to prevent severe, pervasive, and potentially irreversible impacts while allowing ecosystems to adapt naturally, ensuring food production and security, and enabling economic development to proceed in a sustainable manner.”
she added, “The consensus that transpired during this session was that a 2°C danger level seemed utterly inadequate given the already observed impacts on ecosystems, food, livelihoods, and sustainable development.”
The lower temperature limit is necessary for the survival of the flora and fauna, including the human beings.
0.8 degree Celsius increase in temperature is noted and with the increase the negative impacts are already visible.