Cities Now On the Third Wave
Cities grew at a modest pace until about 1800 when the Industrial Revolution took off in the UK and cities developed at staggering rates. Manchester, for example experienced a six-fold population increase from 1771 to 1831. London went from about one-fifth of Britain’s population at the start of the 19th Century to about half the country’s population in 1851. This rate of urbanization has not let up for the last two hundred years; in fact it is still accelerating. The growth of cities seen over the last two hundred years will now be repeated, but this time in just forty years.
Let’s talk trash, just for a few minutes. In the time it takes you to read this pithy blog, more than 14,000 tonnes of waste will be generated: that’s enough to fill the Pentagon in less than a day. More than 1.5 billion tonnes of trash will be generated this year alone. And if you’re inclined to read this blog again in 2025, the amount will have increased to 23,000 tonnes. The annual trash generated at that time will be more than 2.2 billion tonnes a year. That’s enough garbage to fill the Roman Coliseum 730 times, or a line of garbage trucks 900,000 km long, 23 times around the world. Last week’s release of 




