We know little of the consequences of the geoengineering process, such as spraying particles into the atmosphere that shade the planet from the sun's rays and could decrease its temperature. But this process is how dinosaurs disappeared from the Earth about 60 million years ago, by particles spewed by a volcano or a giant meteorite impact, and our species could follow suit.

The first reaction to trauma is denial, then comes anger and finally, acceptance. I think the US is still between denial and anger, and I hope we will reach acceptance because almost perversely, right now, only the US has the technology that is needed for global economic change.

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

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

After denial comes anger and finally, acceptance.

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

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