A part of Mark's urban agriculture is his beehive. Last year was the 1st year he had bees and ended up with 50 pounds of honey. He does a lot of this for conservation particularly with the colony collapse disorder effecting bee population. Plus he wanted to do his part to help pollenate neighborhood urban gardens.
Chickens are the ultimate composters, but Mark does quite a bit of conventional composting as well. Compost is great for your soil. During fall he has a lot of leaves, during spring he has a lot of weeds. If one gets to the weeds before they turn to seed it's just green material. He adds the leaves and green material together. The green and brown break down. He puts them in a crate, turns them and after about 6 months he ends up with some really good soil that he adds to the perennial garden in the front and the vegetables in the back.