The key to a sustainable future lies with the students. It is their passion, their understanding of the issues, and most of all their choices that will shape the future of our planet. As it has through three previous editions, Peter Raven and Linda Berg's Environment gives students all the skills and tools they need to make the right choices for a sustainable environment! Covering the enormous environmental challenges facing our world today, this Fourth Edition helps readers think critically about these challenges and understand the concepts that underlie environmental problems.