There are plenty of problems in the world, and doubtless climate change - or whatever the currently voguish phrase for it all is - certainly is one of them. But it's low on my list.

All change is bad. But sometimes it has to be done.

In our brief national history we have shot four of our presidents, worried five of them to death, impeached one and hounded another out of office. And when all else fails, we hold an election and assassinate their character.

Even very young children need to be informed about dying. Explain the concept of death very carefully to your child. This will make threatening him with it much more effective.

Positive rights are the right to shelter, the right to education, the right to health care, the right to a living wage. These things are - these are, I would call them, more properly, political rights rather than positive rights. And they are extremely tricky, because now we are dealing with things that are zero sum.