I never quite envisioned myself a proper doctor under that white coat, but I was interested in the idea of healing and in the psychological dimension rather early on.

There's more and more recognition that a carbon economy is dangerous to us economically. And there is increasing recognition that renewable fuels have economic value as well as obvious value for our health and our well-being and our survival. In fact, as you know, the economic revolution in renewable fuels has been impressive. It really had not been anticipated.

The American president has particular power. This makes Trump the most dangerous man in the world. He's equally dangerous because of his finger on the nuclear trigger and because of his mind ensconced in solipsistic reality. The two are a dreadful combination.

Donald Trump both disbelieves and believes in falsehoods, so that when he did thrive on his longstanding - the claim that Obama was not born in the United States - he's crazy like a fox in manipulating it because it gave him his political entrée onto the national stage. In order to make your falsehoods powerful, you have to believe in them in some extent. And that's why we simplify things if we say that Trump either believes nothing in his falsehoods and is just manipulating us like a fox or he completely believes them.

I did the first study because I had been exposed to something that I took to be important and interesting - this thought reform process - in the military.

People with what we call mental illness can indeed serve well, and people who have no discernible mental illness - and that may be true of Trump - may not be able to serve, may be quite unfit. So it isn't always the question of a psychiatric diagnosis. It's really a question of what psychological and other traits render one unfit or dangerous.

There's an all-enveloping destructiveness in Donald Trump's character and in his psychological tendencies. But I've focused on what professionally I call solipsistic reality. Solipsistic reality means that the only reality he's capable of embracing has to do with his own self and the perception by and protection of his own self. And for a president to be so bound in this isolated solipsistic reality could not be more dangerous for the country and for the world. He's not psychotic, but I think ultimately this solipsistic reality will be the source of his removal from the presidency.