CK-12 Foundation
Ck 12: Episd: Human Actions and the Sixth Mass Extinction
[Free Registration/Login may be required to access all resource tools.] Through studying the past, students will explore extinction patterns and their causes and consider ways to protect biodiversity across the globe.
World Wildlife Fund for Nature
Wwf: Our Earth: Biodiversity: The Magic of Our Planet
An introduction to biodiversity, offering a look how the planet is "losing" biodiversity and how this loss affects humans and Earth.