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Title
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Air pollutant-induced stress to forest ecosystems: An overview of forest damage
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Date
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1986
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Summary
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In recent years the term "acid rain" has captured the attention of the American public as a possible cause of forest damage and decline. As research progresses, it appears that the adverse impacts of "acid rain" on forest ecosystems are more complex and not as well understood as they generally are for aquatic ecosystems. Different types of air pollution -- including but not limited to precursors of acid deposition -- alone or in combination with stress factors, may pose a wide range of threats to forest ecosystems. This report examines the extent of forest damage and decline in the United States, the dynamics of the forest ecosystem and the major hypotheses put forth by the scientific community to explain the role of air pollutants in forest declines. The report concluded that the forest decline debate must take into account a wider range of pollutants than are usually included in legislative proposals which emphasize sulphur dioxide emissions.
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Title
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Agricultural trade: Selected references, 1983-1984
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Date
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1985
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Summary
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This bibliography lists recent articles, reports, books, and congressional documents on U.S. agricultural trade. The references are annotated and are arranged into three topical sections: the U.S. as an agricultural trading nation; factors affecting agricultural trade; and agricultural trade policy options. The Congressional Research Service bibliographic database was the source of the bibliography.
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Title
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Bilingual education: Recent evaluations of local school district programs and related research on second-language learning
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Date
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1986
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Summary
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This paper analyzes recent evaluations of local school district programs serving limited-English-proficient (LEP) students in the U.S. It discusses the purpose and background of the Bilingual Education Act, describes the Basic Demonstration Projects under this Act, chronicles how the scope of the Federal program has expanded, defines the various instructional approaches for teaching LEP students, and presents the major findings of recent evaluations regarding the effectiveness of various types of local programs serving LEP students. The related research on second-language learning and bilingualism is also synthesized.
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