Agroecology is a subject that is gaining prominence in the recent times because of its necessity today. It's a progressive subject that intersects the key fields of Environment, Agriculture and Food.
If Humanity had a better understanding of Agroecology 100 years back, perhaps many of our today's problem might not even exist. The Green Revolution might have taken a different avatar that's more greener, less polluting and more rewarding. The United Nations has devoted a separate section for this topic in its FAO website - http://www.fao.org/agroecology/en/