In the early 1990s, teachers were buying close to 60,000 books a year. To combat global warming, it recommends that national governments force fuel efficiency, encourage solar energy, and increase reforestation. To preserve biodiversity, it recommends slowing population growth and creating protected areas. Textbooks endorse such groups as sources of information. Certainly, many environmental organizations have useful material, but it is often unscientific and unbalanced.
Some businesses produce materials, too.
But these often echo the same themes. Meanwhile, the federal government is expanding the environmental education effort. The Environmental Protection Agency now has an Office of Environmental Education. Behavior Modification Turning children into environmental crusaders is often an explicit goal. Thirty states have passed laws mandating environmental education.