Environmental planning for the 2002 Olympic games, strategies to reduce ozone levels, focussed on tree-planting programs and identification of cool roofs are early spinoffs from a NASA urban study just concluding in three U.S. cities. Researchers from NASA's Marshall Space Flight Center, flew a thermal camera mounted on a NASA spacecraft over Baton Rouge, Sacramento and Salt Lake City. The thermal camera took each city's temperature and produced an image that pinpoints the cities "hot spots."