rare plants

Examines mass extinctions in history, the environmental impact of humans today, and current damage to various ecosystems. Profiles endangered plant and animal species and contains a section on conservation issues. Includes tables, maps, and color photographs.

Describes briefly the five great extinction periods which have destroyed up to ninety-five percent of all living species, and then moves on to the sixth period of extinction which is now occurring due to human abuse of the environment. Offers guidelines with safe recommendations to increase survival of all remaining species. Also contains more than 400 colorful photographs of severely endangered plants and animals.

Describes plants that are at risk of becoming extinct and efforts to save them.