As an increasing number of teachers across the U.S. add the environment to their lesson plans, corporations are competing with green groups to get their messages and materials into classrooms. For example, Chevron spends about $6 million a year on grants to environmental educators, and the company also produces educational materials on global warming, smog, and the ozone layer. An April survey of environmental educators found that 38 percent used videos, workbooks, or exercises provided by industry, while 57 percent used materials from environmental groups; many report using both.
