Driving along the freeways through northern Ontario (400) and northern British Columbia (1 through Banff), I was amazed to see how many wildlife bridges there actually are. The ones in BC are plainly visible because they go over the road, but the ones in Ontario mostly go under the road in the form of large tunnels with fence funnels on either end, and most people would probably never notice them if they weren't paying attention.

I even saw a few under the highway in the prairies in Saskatchewan and Manitoba. I think those were mostly for moving livestock across the highway though.

--This-- is the point.

Animals need corridors to move between populations

Green roofs would improve the temperature of our homes making to spend less in energy. We should build more, just by our own interest. They are nicer to see than just a roof also.