We have used the majority of our carbon budget and we are already at dangerous levels of CO2 concentrations, about 400 parts per million. The levels were 250 before industrialization. So the problem is what we have done already and, therefore, what must be undone.

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.

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

Trying to conserve a privileged global position makes change traumatic for the US.

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

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.