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...become sufficiently numerous to support an increase in the population of predators. Their hunting success on such a grand scale may eventually lead to a fall in numbers of prey (the blue line falls after a peak) which, after a lag period, in turn leads to a fall in predator numbers, after which the cyclical pattern may be repeated. [Figure 2] Figure 2: adapted from...

...become industrialised countries (Figure 1.1), particularly the use of coal. Homes and other buildings were heated; factories and railways were powered by steam engines (Figure 1.2); mining and chemical industries developed and agriculture became more mechanised. The emergence of technological societies in the 20th century resulted in an even larger increase in energy use...