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Land subsidence invariably occurs when soils rich in organic carbon are drained for agriculture or other purposes . Authentic , meaningful projects are often messy , and their assessments are almost invariably qualitative . Moreover , IRS crackdowns invariably face some political push-back . In each case he identifies three principal arguments invariably used : ( 1 ) the perversity thesis , whereby any action to improve some feature of the political , social , or economic order is alleged to result in the exact opposite of what was intended ; ( 2 ) the futility thesis , which predicts that attempts at social transformation will produce no effects whatever - - will simply be incapable of making a dent in the status quo ; ( 3 ) the jeopardy thesis , holding that the cost of the proposed reform is unacceptable because it will endanger previous hard-won accomplishments .