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

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.

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.

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.

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