Successful movements also need an organisational model that allows them to keep growing.

I might find myself standing, transfixed, by the roadside, watching a sparrowhawk hunting among the bushes, astonished that other people could ignore it. But they might just as well be wondering how I could have failed to notice the new V6 Pentastar Sahara that just drove past.

Immense wealth translates automatically into immense environmental impacts, regardless of the intentions of those who possess it.

Places that have become agricultural deserts, trashed by giant corporations, could be reforested, drawing carbon dioxide from the air on a vast scale. The ecosystems of land and sea could recover, not just in pockets but across great tracts of the planet.

I suffered a lot when I tried to make sanitary napkins and promote the idea. My family - including my mother and wife - deserted me. Villagers even tied me to a tree and beat me. But after seeing me successful now, they come and say that they all knew that I would become famous one day.

I started athletics in 1999, throwing discus and shot put. I didn't tell my family when I started boxing.

I have a daughter and a family.

Teasing and a sense of humor, if you can develop that in your kids, and if you can exercise it with the kids, just makes for a pleasanter atmosphere.