Being quite a keen cyclist I want to talk to you about natural cycles – no, not about biking around the countryside but how substances and elements are moved around in nature. If you research how long the planet has been in existence you will come up with a figure of 4 billon years, give or take a few million. Yet, even after all this time, substances on which nature relies to exist have not been consumed. This seems a little odd, when you think about it – 4 billon years is a very long time. But it’s because Earth is essentially a closed-loop system: very little gets in and…
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