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

We have to remove the CO2 that the industrial economy has already emitted, which otherwise will remain in the atmosphere for hundreds of years and alter the Earth's climate irreversibly. It is possible to do this.

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

The "can do" logic, by its own nature, does not accept limits. And an empire does not have a graceful way to evolve out of this role. History demonstrates this time and again.

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

Even if we planted a tree on every square yard available in the planet by the end of the century we would only capture at most 10 percent of the CO2 we need to reduce. This does not mean that we should not plant trees; we should, for biodiversity's sake, and for our long-term future together with the other species.

If nuclear warfare is believed to be somewhat controlled, then climate change is now the greatest threat.