(a) Domestic availability of soya beans

Oil sources include soya, sunflower, jatropha, groundnut, cotton, canola and a number of others.

So what you're seeing here is actually cotton hulls from Texas, in this case.

If you're in Northern Europe or North America, you can use things like buckwheat husks or oat hulls.

The next three biscuits are the foods that we decide to feed to livestock, the maize, the wheat and the soya.

You want to be able to do this anywhere in the world and not worry about peak rice hull or peak cottonseed hulls, because you have multiple choices.

For example, local materials such as coconut coir and rice hulls have made it possible to adapt substrate systems that would normally have required know how and technically demanding materials (e.g. rockwool) not widely available in Article 5(1) countries.

The ban on tank washing, technical features such as double hulls and sectioning of tanks, introduction of one way sea lanes and, most important, the use of Global Positioning Systems, have greatly reduced the amount of oil entering the sea from tankers.