Speaking as an urbanite, I find this
video really motivating. There is a LOT of unused space in cities all over the world. To use it for urban forestry, growing food, raising bees,
chickens, whatever, is, in my mind, a noble pursuit. There is more possibility for unique and unusual forms of
permaculture in cities than any other place in the world.
As for bees getting their nectar from soda cans - well, many animals that we eat feast on things that we might not personally find desirable - but they turn it into some pretty good stuff! Plus with more urban gardens, the bees will find more deliciousness close to home. Cities have an incredible waste stream - the majority of which can be reused to spread
permie goodness. The more permie goodness spreads in these high population areas - the healthier well all become.
Rock on, urban permies, rock on!