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Complementary information suggests that hydroperiod alterations can be associated with increased ground-water pumping and associated land use changes in the Cache River basin . Small streams are becoming increasingly impacted by stormwater runoff , development , and other land use changes in the Northeast . Students can see if the percentage of each component changes in the area that is being surveyed . Ecosystem and socio-economic models are needed to investigate the differential causes and effects of land use changes in the central region of the U.S. But his efforts to effect changes in the political arena met with very limited success ( because of a persistent lack of financial resources , he claimed ) , and he is better known for his intellectual contributions and influence on later indigenistas . Improving the abysmal human rights situation in North Korea , or achieving regime change in that long-suffering country , may be desirable in the abstract , but U.S. leaders cannot let those goals interfere with the more crucial objective of nuclear disarmament .