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The importance of physical activity
The role of genetics in lifespan
How to maintain a healthy diet
Human and animal excrement is a natural, renewable, and sustainable resource - if only we can overcome our visceral disgust of it!
An average adult produces about a pound (or half a kilo) of poo a day. That means that New York City, with its official census population of more than 8 million, pumps out more than 8 million lbs (or 4 million kg/4,000 tonnes) of excrement a day. Tokyo surpasses that slightly with 8.3 million lbs daily. Chinaâs capital Beijing, a huge urban conglomerate of 21.3 million dwellers, beats NYC and Tokyo combined.
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Dumping waste in a local body of water has proved dangerous. The infamous pandemics of cholera that swept through Europe in the 19th and early 20th centuries were started by faecal contamination of drinking water. Even today, diarrhoeal diseases sicken and kill about 827,000 people a year in the developing world, according to the World Health Organization.
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 If you think about where our food comes from, particularly in colder climates, youâll realise itâs grown someplace else. As our bananas, apples, lettuce, corn and rice grow, they extract nutrients from the land.
That food is then trucked, shipped and flown to where we live â and where we eat it and excrete it. Yet, we donât return that organic matter back to where we got it from, as my grandfather did. We donât drive, sail or fly to return this organic bounty to the land. We flush it down the drain.
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Our local sewage treatment plants clean that water from pathogens, but not from the nitrogen, phosphorus and potassium this wastewater is rich in.
These potent fertilisers usually flow into a body of water nearby, constantly overfeeding the lakes, rivers and the ocean.
That results in toxic algae blooms, dead fish and decaying waterways, which are not biologically designed to absorb so many fertilising chemicals. Likewise, our Earth is not biologically designed to keep growing food without us feeding it.
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Human and animal waste has been misunderstood all along. It is what keeps the earth's ecology balanced.
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