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

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.

The influence of a science adviser is only as good as ears open to that science advice.

For me science is not different from art, except in the one small, crucial detail that experiments speak their own truths, not ours.

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

We wouldn't think of going to our doctor and saying 'Treat me the way doctors treated people in the 19th Century', and yet that's what we're demanding in food production.

We have domesticated crops over a very long period of time, like tens of thousands of years. And crops get - seeds get carried. Sometimes, if they're very small seeds, they get scattered off trucks. Pollen travels.