MONTREAL — The Quebec government has now mapped out how it will achieve 60 per cent of its greenhouse gas emission reduction targets, Premier François Legault said Friday as he announced an updated green economy plan. …The plan also includes $1 billion to reduce the carbon footprint of buildings, which are responsible for almost 10 per cent of the province’s greenhouse gas emissions. About $215 million of that money will help fund projects for thermal waste treatment — methods that transform waste into energy that can be used for such things as heating. Legault said the government plans to create a rating system to assess the energy performance of large buildings. Patrick Bonin, a climate and energy campaigner at Greenpeace Canada, said Quebec is coasting on the fact that most of its electricity comes from renewable sources and argued the plan doesn’t go far enough.