The California Center for Sustainable Energy will host its second annual Sustainability Fair to celebrate taking on a healthy green lifestyle and teach San Diegans how to reduce their carbon footprint, lower energy costs, and curb waste and water consumption. Commercial consumers can learn about renewable technologies and what it means to live sustainably on Thursday, August 6, while residential consumers can experience workshops and lectures on similar topics on Sunday, August 9. Attendees will also have a chance to check out local products and services related to energy efficiency, renewable energy, green building, transportation, and climate change. (858/244-1177, http://energycenter.org)   MASON RICHEY