The Parliamentary Budget Officer (PBO) recently… estimated what would happen to the Canadian economy between now and 2100 if temperatures and precipitation change as expected due to greenhouse gases. The report’s authors consider two scenarios — first, if emission-reduction policies stall at today’s levels and nobody complies with their Paris commitments and, second, if countries comply with all their Paris commitments in full and on time. Under the first scenario Canada’s GDP in 2100 will be 6.6 per cent smaller than it otherwise would be. Let’s pause there for a moment: 6.6 per cent after 80 years is a very small number. …The PBO projects that the impact of climate change will be small relative to other drivers, including population change, technology and many other aspects of socioeconomic development. Where have I heard that before? In the UN Intergovernmental Panel on Climate Change’s 5th Assessment Report, released in 2013, that’s where.