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

Myths about the dire effects of genetically modified foods on health and the environment abound, but they have not held up to scientific scrutiny. And, although many concerns have been expressed about the potential for unexpected consequences, the unexpected effects that have been observed so far have been benign.

One of the really remarkably beneficial aspects of genetic engineering is that much of the previous methodology for controlling pests and so forth is through chemicals that affect a very broad spectrum of insects, for example, or fungicides that control fungi.

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

If Trump wants to withdraw the U.S. from the Paris climate agreement, the rest of the world should impose a carbon-adjustment tax on U.S. exports that do not comply with global standards.

After the ignominious collapse of the Copenhagen global climate change summit in 2009, Bolivia organised a People's Summit with 35,000 participants from 140 countries - not just representatives of governments, but also civil society and activists.

Statistics vary, but in less than seven years there won't be a single cell left in any of our bodies that's the same as it is today. This means that any human being who 'wants' to change is like a mountain river wanting to reach the valley floor. It's a done deal; that's what mountain rivers do, and 'changing' should be our first nature.

I like the outdoors and the natural world. Environmental issues.