National Geographic
National Geographic: Ecosystem Imbalance in the World
In this lesson, students build on their knowledge of individual impacts on the ocean to see how the whole system can react to threats and changes. They examine ways in which human actions throw marine ecosystems out of balance, explore...
American Institute of Biological Sciences
Action Bioscience: Shifting Baselines: Slow Motion Disaster in the Sea
A baseline is a standard point of reference when measuring various things. The catch phrase, "shifting baselines," refers to the slow changes occurring in the environment that ultimately change what the environment was and what is...