The residual blazes underscore how Canada’s energy industry -- underpinned by an oil-sands sector that produces some of the world’s dirtiest crudes — is increasingly imperiled by climate change. Hot, dry weather contributed to the country’s worst-ever wildfire season last year, darkening skies over New York and other US cities. And with over 65% of Canada abnormally parched or in drought at the end of March, the nation is bracing for another smoke-filled summer.
