These levels of total emissions reductions are what is required to avoid the catastrophe. (realclimate.org)
However, with the global demand for passengers expected to double over the next 20 years, further steps must be taken to ensure that efficiency gains will have a net positive effect on total emission reductions. (kleinmanenergy.upenn.edu)
Total emission reduction potential of both approved and proposed projects is nearly 1.5 GtCO2 (410 MtC). (ipcc.ch)