"for #Canada to achieve its goal of net zero emissions by 2050, about 600,000 homes will need to be retrofitted each year. Updated building codes mean new buildings produce lower emissions, but older ones require retrofitting, especially since 80% of the buildings that will exist in 2050 have already been constructed." ‘My own contribution’: the Ottawa immigrants learning to retrofit homes and fight the climate crisis | Climate crisis | The Guardian https://www.theguardian.com/environment/2026/apr/30/ottawa-immigrants-retrofit-homes-climate-crisis #retrofit