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

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

As difficult as it is to eliminate the risk of nuclear warfare, it requires fewer changes to the global economy than does averting or reversing climate change.

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.

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

Trees and clean energy [are] the long-run solution but we have no time to wait for the long run. We need a short-run solution now, and one that encourages and facilitates the transition to the long-run solution.

After denial comes anger and finally, acceptance.