Earth as a Heat Engine (IMAGE) University of Houston Caption The background image of Earth was obtained by NASA's Earth Polychromatic Imaging Camera aboard NOAA's Deep Space Climate Observatory. (Credit: NASA. <a target="_blank"href="http://epic.gsfc.nasa.gov">http://epic.gsfc.nasa.gov</a>). The curves are the time series of the dissipation of the total kinetic energy, which is used to measure the efficiency of the global atmosphere as a heat engine during the modern satellite era (1979-2013). Credit University of Houston Usage Restrictions None License Licensed content Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.