write five changes you observe in the environment present scenario
Answers
Explanation:
THE PROBLEM OF ENVIRONMENTAL CHANGE
The subject of detrimental environmental change has received much attention in the news media for some time. Scientists, policy makers, and the public have become increasingly concerned about the threat that such change, if it continues unabated, poses for the future. Growing numbers of scientists from a variety of disciplines have been systematically studying specific aspects of this change and attempting to identify effective strategies for preventing or mitigating potentially catastrophic effects.
Human factors researchers have not focused much attention on this area in the past. Perhaps it has been assumed that the discipline has little to offer toward the solution of environmental problems. We believe it does have something to offer. This chapter represents an effort to stimulate and contribute to a dialogue that will help identify what some of the possibilities are.
Dimensions of the Problem
Some earth and atmospheric scientists have been documenting an increased concentration of carbon dioxide and other "greenhouse gases" in the atmosphere and have been attempting to better understand how a continuing accumulation will affect the future world climate (Houghton and Woodwell, 1989; National Research Council, 1983). Others have been studying
Page 159 Share Cite
Suggested Citation:"5 Environmental Change." National Research Council. 1995. Emerging Needs and Opportunities for Human Factors Research. Washington, DC: The National Academies Press. doi: 10.17226/4940.
×
Add a note to your bookmark
Save
Cancel
such phenomena as "acid rain" and its effects on lakes and streams, forests, and materials (Baker et al., 1991; Mohnen, 1988; Schwartz, 1989), air pollution and urban smog (Gray and Alson, 1989; National Research Council, 1991; Office of Technology Assessment, 1988), and the thinning of ozone in the stratosphere (Stolarski et al., 1992; Stolarski, 1988). Studies have focused on the contamination and depletion of fresh-water supplies (la Riviere, 1989; National Research Council, 1977; Postel, 1985), on the depletion of the world's forests (Myers, 1989; Repetto, 1990) and wetlands (Steinhart, 1990; Wallace, 1985), and on the worldwide loss of arable land (Crossen and Rosenberg, 1989; National Research Council, 1990; Schlesinger et al., 1990). Biologists have been documenting the loss of wildlife habitat and the accompanying decrease in biodiversity (Soule, 1991; Wilson, 1989). More detailed discussions of the many facets of the problem are readily available (Gore, 1992; Nickerson, 1992; Stern et al., 1992).
Behavioral Causes of Environmental Change
Many of the most readily identified causes of these changes are human activities. Major contributors to the accumulation of greenhouse gases in the atmosphere include the burning of fossil fuels for heating and energy generation and the use of chlorofluorocarbons (CFCs) as coolants and aerosols. The burning of fossil fuels is also a major cause of acid rain, which is formed when airborne sulfur dioxide and nitrogen oxides combine with water vapor. Air pollutants include ozone, carbon monoxide, lead, sulfur dioxide, nitrogen dioxide, and particulates—all by-products of industrial and energy-generation processes. Stratospheric ozone thinning is believed to be a direct consequence of the accumulation of CFCs in the upper atmosphere.
Major threats to clean, fresh-water supplies include contamination not only from precipitation of chemical emissions that have accumulated in the atmosphere but also from agricultural runoff containing pesticides and fertilizers, from waste discharges into rivers, from salt used for highway deicing, from hazardous wastes disposed of improperly, and from leachate from municipal dumps. Deforestation is the consequence both of converting forests to farmland and residential and business areas and of overharvesting timber. Wetland loss results from the "reclamation" of wetlands for commercial development. Desertification, the transformation of arable land into land on which crops will no longer grow, has a variety of causes, including overgrazing and the salinization of soil from excessive irrigation.