Water drops on their way to the drain. How many do you need a day? Water supply for our daily use is getting shorter everywhere. OK, mankind is creative. We're creating alternatives to oil. Brazilian sugar cane ethanol is just an example of that. Some might say more ethanol means less food, but I don't think so. Growing both food and fuel is not a utopia. It's just about having technology and good policies. But I rather doubt we could create an alternative to water.
It's a very simple ratio, we either save water or perish. Think it this way, the very future of your children may be going down the drain as you take a long shower. Terrifying, isn't it?
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