The sun is the source of all energy on planet Earth and we cannot experiment with our only energy source.

The transformation of capitalism is unstoppable because we need limits on resources for humans to survive.

While denial leads to certainty, it is only the certainty of death. This is true for individuals and also for civilizations.

To survive, humans need food, water, and air. Yet biodiversity, the Earth's bodies of water, and the planet's atmosphere are all under threat.

The new markets that arise from ecological constraints will dominate the 21st century economy, and so will markets for knowledge.

We are in the midst of the 6th largest extinction event in the history of the plant and the first caused by human action.

After denial comes anger and finally, acceptance.