- Act 1 covers the ground rules: for human existence, we need food, water, land and a habitable climate. The provision of those needs conforms to some undeniable rules about how our world works.
- Act 2 summarizes the state of our global union: where do we stand, and without some changes, where are we headed?
- Act 3 details some roadblocks on the path to a more sustainable future.
- Finally, Act 4 shows why there are still plenty of reasons for hope.
Follow along with Jim and Alan's slides on SlideShare.