Attenborough starts the second programme by looking at potential future events, before warning that what happens over the next few years is crucial. A BBC weather forecast for the year 2050 shows that summer temperatures of 38°C for the UK are "par for the course". The probable range by which the planet will warm over the next century is between 1.4°C and 5.8°C. Or, says Attenborough, "to put it another way, the impact of global warming will be somewhere between severe and catastrophic."
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