The climate-change deniers are rapidly ending up with as much intellectual credibility as creationists and Flat Earthers. They are nudging close to having the moral credibility of Holocaust deniers.

The bombs held in current nuclear arsenals are seventy times more powerful than the bomb dropped on Nagasaki. If we don't begin opposing the drift towards more and more of them, we will live in the shadow of the mushroom cloud for the rest of our lives - and millions may die there.

The opposite of addiction is human connection. And I think that has massive implications for the war on drugs. The treatment of drug addicts almost everywhere in the world is much closer to Tent City than it is to anything in Portugal. Our laws are built around the belief that drug addicts need to be punished to stop them. But if pain and trauma and isolation cause addiction, then inflicting more pain and trauma and isolation is not going to solve that addiction. It's actually going to deepen it.

The US head of state grew up on food stamps. The British head of state grew up on the postage stamps.

There is an emerging scientific consensus that global warming is making hurricanes more intense and more destructive. It turns out that Katrina fits into a pattern that scientists and greens have been trying to warn us about for a long time.

For all the chatter that Britain has moved beyond class, recent studies have found that it determines the life chances of British people more today than at any point since the Second World War... A child born into a rich family in Britain will almost certainly live and die rich, while a child born into a poor family will almost certainly live and die poor.

You will get something wrong today, and tomorrow, and every day of your life. So will I, and everybody you know. You don’t have a choice about being wrong sometimes: mistakes will be your life-long companion. But you do have a choice about whether to approach your error in terror so you suppress, ignore and repeat it — or to make it your honest, open ally in trying to get to the truth.