How do we judge whether a particular kind of society, economic structure, or policy helps people or harms people? Nobel laureate economist Amartya Sen has argued that our evaluations should be based on the notion of capabilities, that is, on the opportunities that people have to be well-nourished, decently housed, and in many other ways live lives that they find worthwhile.

The definition of freshwater is water containing less than 1,000 milligrams per liter of dissolved solids, most often salt.The global distribution of freshwater resources varies greatly from region to region. An ‘inventory’ of Earth’s waters shows that approximately 97% of the global water supply is found in the oceans, which are saline.

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Agriculture is a crucial economic activity, providing employment and livelihoods for many and serving as the basis for many industries. About 203 million people, or 56.6 percent of the total labor force, were engaged in agricultural labor in 2002.

The United States (US)—contrary to reports of 100 percent access to safe water and sanitation in international surveys—has a complex landscape of low-income water problems. Also, during the late-20th century…

Perhaps the image most often associated with wildland fire is one of destruction. While it is true that fire has a great potential for the destruction of homes, wildlife, and even human life, fire is just one of many natural forces within ecosystems.

Historically, human actions have been inconsequential on the forces of nature, however, humans are now influencing the processes of the planet. The water bodies of Canada and the world are being invaded by non-native or exotic species.

Winds blow because of differences in atmospheric pressure. Pressure gradients may develop on a local to a global scale because of differences in the heating and cooling of the Earth’s surface. Heating and cooling cycles that develop daily or annually can create several common local or regional thermal wind systems.

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