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Exercise keeps me occupied, which is good for my mental health.

It's been proven that fitting more activity into your day can greatly improve your health.

It's been proven by quite a few studies that plants are good for our psychological development. If you green an area, the rate of crime goes down. Torture victims begin to recover when they spend time outside in a garden with flowers. So we need them, in some deep psychological sense, which I don't suppose anybody really understands yet.

In terms of fitness and battling through cancer, exercise helps you stay strong physically and mentally.

The thing we don't want to do is overstate the benefits, but there is all kinds of proof that exercise, both physical and mental, increases brain activity.

'Green' issues at last are attracting serious attention, owing to critically important links between the environment and the economy, health, and our security.

I look at the world through a green lens now, but you can't make yourself crazy. That feeling of green guilt can be really inhibiting. It's about a changing mind-set, remembering to turn off the water when you are brushing your teeth.

Exercising gives me endorphins and energy. I do it four days a week.

I will be Green until the day I die, if not for a long time after.

Green policy is about triggering a shift to a cleaner way of doing things. To be effective, it needs to incentivise the right behaviour, for example through tax breaks, and that needs to be paid for by disincentives on polluting behaviour.