Explores renewable energy sources--particularly wind, water, and solar power--on a global scale, covering the cost, output, and environmental impact of non-renewable sources and the future role of renewables.
Explores factors in climatic change, such as greenhouse gases and carbon dioxide emissions, looks at international efforts to remedy the problem, and discusses whether human activities are contributing to global warming.
Discusses the important role soil plays in environmental health, describes the impact of erosion and contamination, and explores how countries are dealing with the issue of land degradation.
Provides a historical view of drug use around the world, describes the difference between socially acceptable and illegal drug use, and explores the link between drug use and crime.