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He has some crucial and highly sensitive data from his customers stored on " Bob " . Where natural causes of risks are absent , human-induced changes will be present to make people vulnerable . In general that meant that he understood everything that he perceived through his senses and he had the mental ability to make valid logical inferences from that experience , but he had no views on any subject the knowledge of which was beyond the limits of experience . Pollution of freshwater also compounds the existing problems of water availability by raising the costs of treatment and supply .