Not long ago, a group of important environmental leaders published an essay on Gristmill -- "Creating an Earth Atmospheric Trust" -- about Peter Barnes' Sky Trust proposal. As it happens, Rockridge is about to release an analysis comparing Sky Trust with the Lieberman-Warner bill. We particularly evaluate what we call "cognitive policy," which is the set of ideas and values that underlie a legislative or social policy. The Rockridge Institute endorses the key ideas in the Sky Trust. The reasons for our endorsement are best understood by looking at the cognitive policy behind it. This "cognitive dimension" of their policy …