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Obsolete computers contain significant amounts of recoverable materials including metals from wires and circuit boards, glass from monitors, and plastics from casings. For example, 1 metric ton (t) of electronic scrap from personal computers (PC’s) contains more gold…

Concern has grown in recent years over the issue of global climate change. In terms of economic analysis, greenhouse gas emissions, which cause planetary climate changes, represent both an environmental externality and the overuse of a common property resource.

The arctic marine environment covers about 13 million km², of which about 45% is a permanent ice cap that covers part of the Arctic Ocean. Seasonal sea ice forms during winter, and recedes during the short arctic summer, exposing large areas of open water.

The Sahel region in Africa, spanning the entire continent from the Atlantic Ocean to the Red Sea, receives, in the main, the World’s attention in cases of drought, famine or political crisis. The Sahel is a dynamic ecosystem that responds not only to climatic variability bu to human exploitation of biospheric resources.

Question:
I noticed your map of the U.S., with places that had prob­lems and places that were doing better. I noticed that the least densely populated states had the fewest problems. However, of densely populated states, New Jersey, Massachusetts, and John Chafee’s Rhode Island were doing very well. What are they doing right?

Answer:
The question was why […]

What is biodiversity?
Term used to express biological diversity at all levels of life- genes, species, and ecosystems.
What are the threats to biodiversity?
Habitat destruction, fragmentation, and degradation – agricultural conversion, urbanization, wetland draining, forest fragmentation; Water use – infrastructure changes, irrigation, municipal use; Environmental contaminants and pollution; Global climate change; Over-exploitation – over-fishing, over-hunting, poaching and […]

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Amphibians and reptiles have many different adaptations that allow them to live in deserts, avoiding extremes in aridity, heat, or cold. The animals may be active only in certain seasons and at favorable times of the day. Many use the environment to actively regulate their body temperatures, preventing lethal extremes.