If your children want to alter society, listen to their reasons and the idealism behind them. Don't crush them with some clever remark straight away.

Scientists themselves readily admit that they do not fully understand the consequences of our many-faceted assault upon the interwoven fabric of atmosphere, water, land and life in all its biological diversity. But things could also turn out to be worse than the current scientific best guess. In military affairs, policy has long been based on the dictum that we should be prepared for the worst case. Why should it be so different when the security is that of the planet and our long-term future?

Hong Kong has created one of the most successful societies on Earth.

The demand for organic food is growing at a remarkable rate. Consumers have made it clear that they want organic produce and every sector of the food chain is responding, with the kind of results we have just seen.

Climate change should be seen as the greatest challenge to face man and treated as a much bigger priority in the United Kingdom.

Any difficulties which the world faces today will be as nothing compared to the full effects which global warming will have on the world-wide economy.

The simple fact is that the world is not paying for the services the forests provide. At the moment, they are worth more dead than alive-for soya, for beef, for palm oil and for logging, feeding the demand from other countries. ... I think we need to be clear that the drivers of rainforest destruction do not originate in the rainforest nations, but in the more developed countries which, unwittingly or not, have caused climate change.