In this Crash Course video, understand how the ecosystems is affected by human activity. [9:59]

Find out how humans have been changing our environments for a long time. [4:56]

This video highlights human's curiosity with nature and explorin our environment. [4:24]

This lesson will define ecology, natural environment, ecosystem, and environmental deficit, while delineating the formula for calculating human impact on the environment. It is 2 of 3 in the series titled "Environmental Concepts."

This video presents an argument for not using bottled water. Learn about the consequences that come from using the bottles for our environment. Also discussed is a comparison between tap and bottled water nutrients and taste. [8:04]