The most rational defender of nature is driven by a passion for wildness that cannot be explained by an appeal to logic.

It is time to start going door to door and convincing our neighbours to vote for a clean-energy future.

We stand at a moment in history without precedent. Decisions that are ours to make over the next ten years will have a sweeping impact on the future direction of life on the planet.

One hundred years ago, visionary political leaders from the Progressive Era established a system of national forests and parks in our country that are the envy of the world and today are the treasure of an entire nation. Why not a similar, global vision for our generation?

It will be politics that determines the material welfare of future generations: the pace at which we advance toward "our destination of economic bliss," andnperhaps, whether we continue to advance at all.

I tell my graduate students [at Bard College], ‘There are two ways to change the world: through policy, or through sustainable business.’ With sustainable business, individuals build solutions within the current system… Sustainable business asks, ‘How would nature do this?’

The Arctic is the planet's air conditioner and it's starting to break down.