1. As of the time of writing, the federal government of Canada had not committed to exact reduction targets for 2050 and 2100, though some aspirational goals were agreed upon during the 2015 G7 Summit in Germany. Some provinces have stated goals of reducing GHG emissions within the range of 75 to 85% by 2050;Canada's 2020 target was formalized in the Copenhagen Accord,2009
2. The Constitutionality of Federal Climate Change Legislation;R Alistair;SPP Research Papers,2009