Little wonder that it can seem unthinkable to say "no, thanks" to the modern-day equivalent of our tribe - our fear-driven culture.

My children threw me a life line: "Return to your roots - food - and rewrite your first book, Diet for a Small Planet." I learned that if I could just show up, in this case, if I could just get myself out of bed, get to the computer in my tiny office at MIT, and start writing, help would start arriving.

We are very much social creatures who model ourselves on one another.

In the late 1960s, there were alarming predictions that worldwide famine was around the corner. I wondered if humans had already lost the race, overrun the Earth's capacity. I let one question lead to the next, and unearthed information that would forever change my life: Not only is there enough food in the world to feed every man, woman, and child on Earth, there is enough to make us all chubby.

Hope is not wishful thinking. It's not a temperament we're born with. It is a stance toward life that we can choose...not not. The real question for me, though, is whether m hope is effective, whether it produces or is just where I hide to ease my own pain.

What has dawned on me is that focusing on the "finite planet" frame sends a message that we have gone as far as Nature can take us and therefore we need to give power to forces outside Nature.

There is no formula. We all must become spirited inventors. There's no single answer - not even a single starting point. Even the 'teachers' ... don't offer us the answer. They do offer us approaches, ways of thinking, possibilities we can adapt, and hope that might generate in us wholly new ideas.