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.

Organic farming has been shown to provide major benefits for wildlife and the wider environment. The best that can be said about genetically engineered crops is that they will now be monitored to see how much damage they cause.

When people are uncertain about what is right and what is wrong, and anxious about being considered old-fashioned, it seems to be worse than folly that Christians are still arguing about doctrinal matters which can only bring needless distress to a number of people.

The world's forests need to be seen for what they are - giant global utilities, providing essential public services to humanity on a vast scale. They store carbon, which is lost to the atmosphere when they burn, increasing global warming. The life they support cleans the atmosphere of pollutants and feeds it with moisture. They act as a natural thermostat, helping to regulate our climate and sustain the lives of 1.4 billion of the poorest people on this Earth.

Conservation must become before recreation.

Business is recognizing the role it can play in combatting climate change. Thank God, is all I can say, for there is a desperately urgent need for business to play that role. Your lobbying influence can be substantial, but together, united and in large enough numbers it could prove decisive in turning the tide.

If you think about your and my grandchildren, this is what really worries me. I don't want them - if I'm still alive by then - to say, 'Why didn't you do something about it?', when you could have done.