It still is, faster and faster, and the canal is just one victim of what has become a vicious cycle. Always short of water, Mexico City keeps drilling deeper for more, weakening the ancient clay lake beds on which the Aztecs first built much of the city, causing it to crumble even further.
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"Investors say to us: 'don't talk to us about returns'; they want to know how we're managing water," Nick Holland, Chief Executive Officer of Gold Fields, said at an international mining conference in Cape Town. 
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