This image of goats controlling the weeds at a San Francisco bus yard is whimsical and inspiring. Why doesn’t Tokyo (and other big cities) use these natural weed-eaters? The company behind this is called City Grazing, and their slogan: “Our herd of goats are organically fed, will eat your weeds and entertain your children!”
Tokyo Green Space 
It would be fun to see goats roam around the super-urbanized Tokyo.
Its a great idea, mixing natural and urban life, i think the balance can be achieved and it would help us to have a more earth friendly lifestyle.