I remember as a boy when the conversation on civil rights was won in the South. I remember a time when one of my friends made a racist joke and another said, 'Hey man, we don't go for that anymore.'

I don't really consider this a political issue, I consider it to be a moral issue.

We are monumentally distracted by a pervasive technological culture that appears to have a life of its own, one that insists on our full attention, continually seducing us and pulling us away from the opportunity to experience directly the true meaning of our own lives.

I doubt nuclear power will play a much larger role than it does now.

I flew on Air Force Two for eight years, and now I have to take off my shoes to get on an aeroplane.

Two thousand scientists, in a hundred countries, engaged in the most elaborate, well organized scientific collaboration in the history of humankind, have produced long-since a consensus that we will face a string of terrible catastrophes unless we act to prepare ourselves and deal with the underlying causes of global warming.

The moral imperative to make big changes is inescapable...that what we take for granted may not be here for our children