In this 21st century we again need a green revolution to feed additional four billion people. In the early part of the last century, we were struggling to feed even two billion people and the green revolution allowed us to feed an additional four billion people. It is unfortunate that we cannot afford the green revolution of the 20th century. This is because our agriculture has evolved into an enterprise that is not eco-friendly, and it already ranks among top 10 threats to the health of the planet.