Using local energy sources such as waste wood and lake water to heat and cool buildings is one way for communities to cut their greenhouse gas emissions — a stated goal of this week’s UN climate summit.

Here’s a look at how six communities across Canada are doing it.

– Charlottetown District Energy System

– Deep Lake Water Cooling System

– Drake Landing Solar Community

– Île-des-chênes District Energy

– Teslin Biomass Project

– False Creek Neighbourhood Energy Utility