The C40 Cities Climate Leadership Group is a global network of major cities committed to addressing climate change through ambitious local action. Member cities—including Montreal, Toronto, and Vancouver from Canada—collaborate on climate strategies, share best practices, and make collective commitments to reduce emissions. While climate policy involves all government levels, C40 demonstrates how cities can lead on climate action within their jurisdictions through building codes, transit investment, land use planning, and local programs. The federal government often coordinates with C40 cities on national climate strategies, recognizing that cities are where most Canadians live and most emissions occur.