There are lots of different questions there.
The question whether organic agriculture can sustain yields is a very interesting one, and it's very much broader. If we're talking about feeding the world's population, the issue of food supply goes much farther than just yield, involving distribution and management and dealing with quality and storage and so on. There's a lot of discussion we could have around that.
Organic agriculture and the research in organic agriculture are relatively new. Yes, we definitely are making progress. We're developing new crop cultivars that are adapted to low-input conditions. Those are starting to become available in the next two years. It takes about ten years to develop each new cultivar, so this takes time.
In terms of the other benefits of organic farming practices, we definitely see more biodiversity on organic farms. We definitely see reduced nitrogen leaching losses from organic farms and lower nitrogen emissions. Organic farms don't use nitrogen fertilizers. Nitrogen fertilizers in themselves account for about 40% of the energy costs and hence of carbon dioxide emissions coming from agriculture.
That in itself is a huge contribution to the environment. The trade-off is that if we want to build the soil, have healthy soil, and capture the nitrogen out of the atmosphere using leguminous plants, we have to build those into our crop rotation, and it takes a year out of production to do it. But when we look at all the external costs associated with conventional agriculture and the impacts we've had, if we were to take those costs and invest them in the system, then I think there would be opportunities for tremendous improvement in the benefits organic production confers.