Even as the population doubled from three to six billion, we managed to race ahead with all kinds of technological and scientific events in agriculture - from using more fertilizers to mechanization to advanced plant breeding.

Civilization depends on our expanding ability to produce food efficiently, which has markedly accelerated thanks to science and technology.

We have six-and-a-half-billion people on the planet, going rapidly towards seven. We're going to need a lot of inventiveness about how we use water and grow crops.

India has the opportunity to be a leader in genetic engineering, It has institutions that no other country has.

Weeds do become resistant to herbicides, and it needs to be managed with multiple herbicides.

There are probably already too many people on the planet.

If everybody switched to organic farming, we couldn't support the earth's current population - maybe half.