Four years ago, British ­Columbia endured the ­deadliest weather event in recorded ­Canadian history. The 2021 heat dome claimed the lives of more than 600 ­people, many of whom died alone in overheated homes. As we mark the fourth anniversary of this devastating mass casualty event with record-breaking heat elsewhere in the country, we must confront a troubling truth: B.C. remains dangerously unprepared for the next one. Despite some advancements, including updated building codes, rebates for heat pumps and a now-depleted $30-million fund to provide vulnerable households with air conditioning units, one of the most critical aspects of climate readiness has seen little to no progress. In fact, it’s getting worse. Our communities are rapidly losing tree canopy, green space and permeable surfaces — the very elements that keep cities cooler during extreme heat.