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However, open-air nuclear testing between 1955–1980 contributed to this pool.

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Anthropologists can describe a people’s physical character, culture, and environmental and social relations.

Archaeologists, on the other hand, provide proof of authenticity of a certain artifact or debunk historical or anthropological findings.

When fossil fuels burn, they emit greenhouse gases like CO2 that contribute to global warming.

Ninety-eight percent of atmospheric CO2 comes from the combustion of fossil fuels [source: Energy Information Administration].

A carbon footprint is simply a figure -- usually a monthly or annual total of CO2 output measured in tons.

Web sites with carbon calculators turn easy-to-supply information like annual mileage and monthly power usage into a measurable tonnage of carbon.

Nearly one third of anthropogenic carbon dioxide is being absorbed by the oceans today(Science Daily, May 24, 2008) .

Uptake of carbon dioxide by the oceans is not a harmful phenomenon , but excess of it leads to a reduction in p H thereby altering the fundamental seawater chemistry, commonly known as ocean acidification ....

It is in knowing what made past cultures cease to exist that could provide the key in making sure that history does not repeat itself.

Over the years, archaeology has uncovered information about past cultures that would have been left unknown had it not been with the help of such technologies as radiocarbon dating, dendrochronology, archaeomagnetic dating, fluoride dating, luminescence dating, and obsidian hydration analysis, among others.

This resemblance is used in chemical and biological research, in a technique called carbon labeling: carbon-14 atoms can be used to replace nonradioactive carbon, in order to trace chemical and biochemical reactions involving carbon atoms from any given organic compound.

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