Can Sustainable Intensification Feed the World?

If we are to feed by 2050 a growing population that is increasingly adopting western style diets we will  have to intensify food production - producing more but on the same amount or less of land and with the same  amount or less of water. Moreover this has to be done in a sustainable manner, i.e. with much lower environmental impact and greater resilience. We can do this with ecological approaches, genetic approaches and socio-economic approaches. Each has its pros and cons.