HEI is the relationships between people and their environment. How people adapt to their environment, and how they change it.
In Montreal humans cut down trees also known as deforestation. It effects the environment. They also cause air pollution by burning fossil fuels.
In Montreal there is something called permafrost, which effects humans because they cannot build their houses on top of it. If they did the heat from their house would melt it and cause their house to sink.