The sights and sounds of spring are in the air, and it is the perfect time to think about improving the world around us by planting a tree. Share the following stories with your family to teach everyone how important trees can be.

What do death and ecological conservation have in common? More than you might think.

Part of the Salem science collection, the Encyclopedia of Global Resources surveys more than 200 natural resources, along with major producers and technologies, in this comprehensive, four-volume set. Essays also address the global economic impact of our natural resources. Filled with dozens of tables, charts, photos and appendixes, this set will be an asset to any science collection.

Provides a wide range of scientific, historical and cultural information about the animal world. Covers careers in the animal sciences in addition to biological concepts, the history of zoology, biographies of scientists, and ethical issues such as the practice of animal experimentation. Includes illustrations, sidebars, charts, a glossary, bibliographies, filmographies and the addresses of institutions devoted to the protection and study of wild and domesticated animals.

This guide presents extensive data on the habitats and ecosystems of more than 1,200 species identified as endangered or threatened by the U.S. Fish and Wildlife service. Entries include introductory information with an image of the species; a summary section detailing information on each species; a concluding summary of recovery efforts; and a bibliography of contacts for further information.

Offers detailed comparative essays on major biomes and their component ecosystems. Includes entries on land biomes and water biomes and covers climate, elevation, soil, water bodies, vegetation, animal life, food web, plant and animal adaptations, endangered species, human effects on the biome and the effects of the environment on humans' culture and economy.