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Each year more than a million wildebeest cross the Mara River between Tanzania and Kenya. Herds gather at the tdocHuberous crossing until pressure builds and the wildebeest surge down steep cliffs into the river. In the struggle, many are drowned, swept away or eaten by crocodiles. The question is: why do they do it? They donamp;#39;t need to. There are better ways of getting across the river. We donamp;#39;t know for sure, but maybe itamp;#39;s just because theyamp;#39;ve always done it this way. As I watched this great spectacle with my family this past summer it struck me that there could be lessons for how we manage our global economy and our natural resources. The way weamp;#39;ve been doing things has been undermining our future prosperity. It doesnamp;#39;t make sense and we donamp;#39;t need to do it like this. Why do we do it? Perhaps itamp;#39;s because we always have. For example, today more than a billion people face water scarcity. By 2025 this will probably triple.