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Why are
heatwaves getting hotter?
More than
a century’s worth of fossil fuel pollution has clogged the atmosphere, trapping
sunlight and heating the whole planet. Average global temperatures have risen
by about 1.3C since preindustrial times – and land temperatures by even more –
which has pushed the baseline higher and made punishing extremes far more
common.
There is
also some evidence that the climate crisis is making heatwaves worse by
weakening the jet stream. Scientists think this is increasing the occurrence of
heat domes, which are areas of high pressure and heat that get stuck over a
region for days or even weeks.
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