Climate change is new and complex. We don't have all the answers.

Geoengineering means changing the Earth's fundamental large-scale processes.

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

Climate change is new and complex. We don't have all the answers.

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

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

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.