But that’s not the way Dwaine MacDonald sees it. MacDonald is one of the co-founders of Trinity Energy Group, a company based in Stellarton, N.S., that makes commercial and residential buildings more energy-efficient, through better insulation and thermal barriers. And business is very good.

To give a sense of Trinity’s expertise, in 2010, the company worked on a 14-bedroom farmhouse that every year required 14 cords of wood and two barrels of oil for their heating needs. Trinity’s retrofit brought it down to four cords of wood and half a barrel of oil.

Clean Energy Canada found that in 2017, there were almost 300,000 jobs in the clean-energy sector — more than the approximately 200,000 positions in the petroleum sector.