So you've decided to travel around the world. This is an excellent thing to do. It's a precious place, this planet. We should see it.

You can read and read, but nothing eclipses experience.

It is a remarkably easy thing to do, pointing out the faults of others and suggesting remedies or courses of action in an argumentative and pedantic sort of way, and I am still amazed that there are many people in the American media who are paid very big money to do this.

The gift of sobriety is clarity and a sense of connection - and travel only enhances that.

From a planning perspective, economic degradation begets environmental degradation, which begets social degradation.

More businesses should be following Apple's stance in encouraging more investment in sustainability.

After spending three or four years interacting with the Bush administration, I realized they were not taking any actions to deal with climate change. So, I decided to give one talk, and then it snowballed into another talk and eventually to even protesting and getting arrested.

Ever since the collapse of cap and trade legislation and the realization that President Obama is unlikely to ever utter the words 'climate change' in public again, much less use the bully pulpit to prepare the nation for the catastrophic risks of inaction, the movement has been in a funk.