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

After denial comes anger and finally, acceptance.

Signs of a poorly understood but treatable house fire requires action, not inaction.

The "can do" logic, by its own nature, does not accept limits. And an empire does not have a graceful way to evolve out of this role. History demonstrates this time and again.

The change in economic values created by the new markets for global public goods will reorient our global economy and under the right conditions can usher the satisfaction of basic needs of the present and of the future. This is what is needed right now.

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

Changing the world's oceans to increase their uptake of CO2, as other geoengineering solutions propose, is equally dangerous, as the increased resulting acidity of the oceans kills tiny crustaceans, such as krill, that are the basis of the pyramid of life on the planet as we know it.