We often associate the big city with swathes of concrete, metal and glass. We often associate agriculture, on the other hand, with "traditional" farms out in the countryside. It doesn't have to be this way. It's true that these ideas are far from baseless— urban areas are visually less green than rural ones (though they pollute less per capita). However, green urbanism, a more sustainable and attractive model than our current one, could be the future of cities around the world. Why adhere to traditional views of what "the big city" should be? The image above shows an example of urban…