"Climate risk avoidance, energy security, sustainable land use, population growth and equitable economic development constitute a key set of interacting challenges for humankind in the 21st century," stated 20 Nobel prize-winning scientists, economists and writers -- including U.S. physicist and Secretary of Energy Steven Chu -- along with 40 other prominent intellectuals in an "Action for a Low Carbon and Equitable Future" memorandum from the St. James's Palace Nobel Laureate Symposium convened under the patronage of the Prince of Wales by the University of Cambridge Programme for Sustainability Leadership, citing powerful scientific evidence of the need to "confine the temperature rise to 2 degrees Celsius (3.6 F) to avoid unmanageable climate risks." A London Times article that contains a short video is available here - http://bit.ly/xg2uB . A copy of the memorandum can be found at this link - http://bit.ly/oLcVM .