BY SILAS ALLEN, Staff WriterA group of environmental activists, clergy and others plans a demonstration Sunday in Oklahoma City to call for greater action to combat climate change. Nathaniel Batchelder, one of the organizers, said the march will emphasize three points: climate change is real, it’s predominantly caused by human activity, and all humanity must participate in solutions. Batchelder, director of the Peace House in Oklahoma City, said the march is intended to challenge federal policymakers and others who question the science behind climate change.Read more on NewsOK.com