American Institute of Biological Sciences
Action Bioscience: Issues in Environment
This site from American Institute of Biological Sciences provides a collection of articles on current issues in environmental science and human impacts on the environment. Several articles available in Spanish.
CK-12 Foundation
Ck 12: Habitat Destruction and Its Effects on Ecosystems
[Free Registration/Login may be required to access all resource tools.] Some of the main ways that habitats are destroyed by human activities are described. Includes two videos and questions about them, as well as review questions.
McGraw Hill
Mc Graw Hill Ryerson: Human Impacts on Ecosystems
Take this ten question quiz on human impacts on ecosystems. The quiz is multiple choice.