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

We need to support our future instead of undermining human survival. Let's do it.

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

We need a transformation of the world economy and of how we use and share the Earth's resources. We are running out of time. We are truly at the point of no return.

The consensus is that climate change ranks along with nuclear warfare as the top two risks facing human civilization.

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.

Climate change is due to the use of energy for industrial growth, which has been and is overwhelmingly based on fossil fuels.