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  1. 1
    061958

    Population and the greenhouse effect.

    Zero Population Growth [ZPG]

    Washington, D.C., ZPG, 1988 Aug. [2] p. (ZPG Fact Sheet)

    Industrialized nations have emitted gases, which are transforming the Earth into a greenhouse, into the atmosphere for many years. Carbon dioxide (CO2), produced by burning fossil fuels and wood; chlorofluorocarbons (CFCs) released by refrigerants and other sources; nitrous oxides, generated by fossil fuels; and methane, produced from decomposition of organic matter, trap infrared rays thereby causing an unprecedented rate of global warming. In the period from 1900-1988, the concentration of CO2 has climbed 20% and the average global temperature has risen >1 degree Fahrenheit. Further, since 1963, the rate of increase of atmospheric CO2 essentially equals population growth. Population growth also directly contributes to the increase in atmospheric methane. Forests naturally remove CO2 from the air, yet humans are destroying about 27 million acres of tropical forests/year. If the present fossil fuel rates persist, CO2 concentration will increase 2 fold by 2050 causing a mean global temperature increase of 9 degrees Fahrenheit. Other computer simulations predict changes in global precipitation, droughts, a rise in sea level by 1-4 feet, and the extinction of many species of plants and animals. Scientists major concern is the suddenness of this climatic change because it leaves little time for humans and plant and animal species to adapt. The World Meterological Organization of the United Nations advises that all nations ratify the recommendations of the 1987 Montreal meeting on ozone. 1 recommendation states that the industrialized nations must reduce the production and consumption of CFCs by 50% by the end of the century. Since the US consumes 28% of the world's annual energy consumption, the US should led the world in energy conservation. Any approach that does not advocate resource consumption and population stabilization will fail, however.
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  2. 2
    157833

    IB89005: Global climate change.

    Justus JR; Fletcher SR

    Washington, D.C., National Council for Science and the Environment, 2001 Apr 11. 10 p. (CRS Issue Brief for Congress)

    Global warming, a result of human activities affecting the heat-energy exchange balance between earth, atmosphere and space, is said to have far-reaching effects on agriculture, forestry, and ecosystems. Attention has been focused on possible extremes of climate change and need for better understanding of climatic processes. However, the US dependency on fossil fuel makes the emission reduction effort a challenge. In response, the Congress reviewed scientific information on climate change in order to formulate policy responses. This problem is addressed to world leaders since it is a global concern calling for participation in international conferences, passage of legislation, and communication with international organizations. On the other hand, the administration of President George Bush considers the 1997 UN Kyoto Protocol, which is aimed to legally bind the emission reductions. In view of this, a review of the US climate policy was initiated seeking new approach to international cooperation.
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  3. 3
    075121

    Saving our planet: challenges and hopes. The state of the environment (1972-1992).

    United Nations Environment Programme [UNEP]

    Nairobi, Kenya, UNEP, 1992. [8], 200 p. (UNEP/GCSS.III/2)

    Current knowledge and issues between 1972-92 on the environment, development activities, human conditions and well being, perceptions and attitudes, and challenges and priorities for action are addressed. 10 major environmental issues are discussed: atmospheric pollution, ozone depletion, climate change, marine pollution, freshwater resources and water quality, land degradation and desertification, deforestation and degradation of forests, loss of biological diversity, environmental hazards, and toxic chemicals and hazardous wastes. Development activities that impinge on the environment are agriculture and food production, industry, energy use and production, transport, and tourism. The human conditions affected by management of population, the environment, and development are population growth, human settlements, human health, and peace and security. The historical changes that have occurred in 20 years are reported. Government's and individual's changes in perceptions and attitudes to environmental changes are also represented. 20 years after the Stockholm conference, there are still gaps in the understanding of the environment. Governments are limited in their ability to estimate the cost of repair, or to gauge the cost of failing to take rapid action to stop the degradation. There is a lack of confidence in the capacity of national and international managerial systems to apply what is known or to mobilize effective action. There has been a squandering of the world's stock of productive natural resources and a degradation of the environment; the geopolitical map has changed. The planning and implementation of development programs must change significantly; the global economy must be restructured. International cooperation is crucial. Multinational forums have not been successful in concrete action which promotes global economic recovery. National governments have been able to proceed from good intentions to more positive actions. There is growing concern about conflicts between international trade and environmental objectives. Regulatory measures by 1995 are needed for reforestation, marine pollution, hazardous waste removal, chemical risk assessment, environmental emergencies technology transfers, environmental impact assessment, and policies of environmental agreements which lead to major deterioration; by 2000 a means of compliance and verification of environmental treaties will be required. Goals for assessment and management are identified as well as the development of global costs for further degradation and additional resources.
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  4. 4
    047690

    The earth's vital signs.

    Brown LR; Flavin C

    In: State of the world 1988. A Worldwatch Institute report on progress toward a sustainable society. New York, New York, W.W. Norton, 1988. 3-21.

    Most of the recognized threats to the world environment, such as the destruction of forests by acid rain, the ozone hole, population growth, energy use, and the greenhouse effect, have moved from hypothetical projections to present-day realities which can be solved only by international efforts. The Montreal accords of 1987 to limit the production of chlorofluorocarbons and the UN call for a cease-fire in the Iran-Iraq war were steps in this direction. But a look at the "vital signs" of the earth as expressed by environmental crises will show how much more is needed. Deforestation for agriculture and logging causes as estimated loss of 11 million hectares of forest each year. Deforestation means erosion. The topsoil layer, once 6-10 inches deep over the globe is being blown or washed away at the rate of 26 billion tons a year. The soil is not only being depleted, it is being contaminated by agricultural pesticides and toxic wastes. In Poland, for example, 1/4 of the soil is unfit for food production, and only 1% of the water is safe for drinking due to chemical contamination. The depletion of the ozone layer is no longer observed only in Antarctica; it has dropped up to 9% in North Dakota, Maine, and Switzerland. The loss of forests and the acidification of lakes and soil are causing whole species to become extinct. World population continues to grow, as each year 80 million more people are born than die. But the real problem is not population growth per se; it is the relationship between population size and the sustainable yield of local forests, grasslands, and croplands. In 1982 India's forests could sustain an annual harvest of 30 million tons of wood; the estimated demand was 133 million tons. In 9 Southern African countries the number of cattle exceed the carrying capacity of the grasslands by 50% to 100%. In India enough fodder is raised to supply only 50% to 80% of the needs of cattle. The results of deforestation, overgrazing and overplowing is desertification, which compounded by drought, brings famine. The relationship between population growth and land degradation is reflected in per capita food production. In China it has risen by 1/3 since 1970, but in Africa it has fallen by 1/5; and India, despite the Green Revolution, will have to import grain if there is another failure of the monsoons. Another indicator of environmental ill-health is energy consumption, which is again on the rise. Industrial use of oil and coal, especially in the US, the USSR, and China, has resulted in air pollution and acid rain, which by September 1987 had damaged 30.7 million hectares of forests in Europe. But by far the most serious result of the burning of fossil fuels and wood is the 7 billion tons of carbon discharged annually into the atmosphere, causing the greenhouse effect, which will raise the global temperature between 1.5 and 4.5 degrees Celsius by year 2050. Patterns of World settlement and agriculture will change drastically; irrigation and drainage systems will have to be adjusted; and a rise in sea levels between 1.4 and 2.2 meters by year 2100 could inundate coastal cities. In view of these deteriorating "vital signs" of the planet, nations must work together to turn one earth into one world. The Montreal accord on ozone protection and the 1987 US-Soviet arms limitation were a good beginning. The greenhouse effect and the changing climate are logical candidates for the next round of world environmental deliberations.
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