According to experts at The Motley Fool, citing a study conducted by Mercer for the philanthropic organization Ceres, investment opportunities in such sustainable areas as clean energy and climate adaptation may be worth more than $5 trillion over the next 15 to 20 years. For example, individual companies such as Apple would like to power 100% of their data centers using renewable energy, and are working with many companies to accomplish this goal. Apple currently operates the largest solar array in the United States. Furthermore, the State of California, seen by many to indicate future trends in action, increased its solar installations by 26% during 2012 and 2013.