How do you spur world action on this issue when there are still questions out there about future levels of CO2 in the atmosphere and the range
of future temperature increases?
For example, USGCRP agency data was used to develop Chicago's Climate Action Plan, which addressed
future temperature increases by helping property owners create green landscapes and operate with increased energy efficiency (green roofs and landscapes absorb less heat than concrete or asphalt and therefore lessen the urban heat effect).
This «technology push» approach results in cumulative emissions from the energy sector of around 750 GtCO2 between 2015 and 2100, which is consistent with a 50 % chance of limiting
average future temperature increases to 1.75 °C.
''... while claiming «strong evidence» exists that warming has been caused «largely by human activity», it acknowledges that the size
of future temperature increases and other aspects of climate change are «still subject to uncertainty» and that the attribution of forced cl...
To limit
future temperature increase to 2 °C, emissions must peak soon, as shown by the blue line on the right.
«Data from the past helped calibrate our model, and will improve sea level rise projections under scenarios of
future temperature increases,» says Rahmstorf.