Last Updated: Jul 28, 2017
Get an overview of topics, as well as find links to articles, web sites and media clips. Click the button and choose Britannica Online: Academic Edition from the list displayed to search.
- Acid Rain: Topic Page
Acidic precipitation thought to be caused mainly by the release into the atmosphere of sulphur dioxide (SO2) and oxides of nitrogen (NOx), which dissolve in pure rainwater making it acidic.
- Alternative Energy: Topic Page
At the center of energy issues in the United States is the growing realization that in order to sustain this level of energy consumption, a transition away from fossil fuels to more reliable and sustainable sources is needed.
- Biological Invasions: Topic Page
Invasive species in general are defined as species that occupy or are in the process of occurring in regions where they have not been present historically.
- Carbon Footprint: Topic Page
Measure of the amount of greenhouse gas (GHG) emission involved in human activity.
- Deforestation: Topic Page
Forests are generally defined by the amount of tree canopy cover; deforestation is removal of tree cover.
- Ecotourism: Topic Page
Tourism is often described as the world’s largest industry and, while a small component of the overall industry, ecotourism is believed to be one of the fastest growing sub-sectors.
- Fracking: Topic Page
Most natural gas is obtained by drilling a well into a pocket of gas trapped beneath an impermeable layer within the Earth.
- Green Movement: Topic Page
The environmental movement is a social movement dedicated to the management, protection, and restoration of the natural environment.