Friday we celebrate Earth Day and this year’s theme is a people-powered campaign titled A Billion Acts of Green. The goal is to generate a billion acts of environmental service and advocacy before the United Nations Conference on Sustainable Development in Rio de Janeiro, Brazil in June of 2012. Peace Tree Brewing Company in Knoxville is doing their part to help encourage area residents to be conscious of how they affect the world. The brewery is giving away 50 tree saplings to the first people to visit after 4pm. In addition, there will also be materials available for kids of all ages to build a terrarium project both Friday and Saturday.