Although I have been a long-time member of the American Geophysical Union (AGU), I hereby refuse to pay my membership fees. The main problem is the organization’s Position Statement on the purported “Human impacts on Climate” This statement includes the following statements: “During recent millennia of relatively stable climate, civilization became established and populations have grown rapidly. In the next 50 years, even the lower limit of impending climate change—an additional global mean warming of 1°C above the last decade—is far beyond the range of climate variability experienced during the past thousand years and poses global problems in planning for and adapting to it.
Warming greater than 2°C above 19th century levels is projected to be disruptive, reducing global agricultural productivity, causing widespread loss of biodiversity, and—if sustained over centuries—melting much of the Greenland ice sheet with ensuing rise in sea level of several meters. If this 2°C warming is to be avoided, then our net annual emissions of CO2 must be reduced by more than 50 percent within this century. With such projections, there are many sources of scientific uncertainty, but none are known that could make the impact of climate change inconsequential. Given the uncertainty in climate projections, there can be surprises that may cause more dramatic disruptions than anticipated from the most probable model projections.”
As an active communicator in geophysics, spanning subjects ranging from marine geology to climate science, and an expert reviewer for the IPCC Working Group 1 on the up-coming Assessment Report 5 (my comments have just been submitted to the organization), I can no longer bear to support the AGU.