[T]he Ahwahnee Principles for Climate Change is one of the finest, simplest, most straightforward pieces that I’ve seen over the years; congratulations.
— Tom Rosewall, Watsonville, CA
Climate change is not just another environmental issue. Concentrations of human induced greenhouse gases (GHG) in the atmosphere have already reached unprecedented levels and are causing well documented adverse changes to our planet’s physical and biological systems. We must act decisively to reverse this trend, to lessen the potentially devastating environmental, economic and social impacts that could result. At the same time, we must predict and prepare for, and adapt to, the unavoidable climatic changes that will likely occur due to the high concentration of greenhouse gas pollutants that are already in the atmosphere.