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Humans have long sought to geoengineer the Earth’s environment. Tim Flannery outlines a few of the wildest ideas from the 20th century

An increasing number of scientists think we have let the climate crisis fester for so long that our only hope to stave off ever-intensifying catastrophes is to use technological interventions. Cloud brightening, injecting sulphur into the atmosphere and the use of tiny mirrors in space – all of which might reduce the amount of sunlight reaching Earth’s surface – are among the concepts being promoted by entrepreneurs and governments alike. Geoengineering, they argue, is now inevitable.

Ever since the God of the Old Testament granted our species dominion over the Earth, ideas of remaking the world to better suit us have been a dominant thread in human thinking. We have for centuries toyed with grand ambitions to alter and re-form the climate and environment, many of which – in retrospect – seem doomed or absurd.

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As Britain reached its hottest June temperature on record, readers recall the summer when temperatures hit 36C

The recent heatwave in the UK broke the previous June record of 35.6C, recorded during the 1976 heatwave.

In Lingwood, Norfolk, a provisional temperature of 37.7C was recorded on Friday 26 June, breaking the previous record reached on 28 June 1976 and on 29 June 1957.

Cooling down has become political amid record highs, as experts say row is distracting from work of protecting lives

As the afternoon heat rose to a dizzying 41.7C (107F) in eastern Brandenburg on Sunday, taking German temperatures to unprecedented highs, Mario, 65, took precautions but did not panic. Two years ago, a fierce heatwave had prompted him to buy a powerful device that few Germans own: an air conditioning unit.

“The summers are slowly getting warmer,” says the retired handyman in Neuzelle on the German-Polish border, whose bungalow is now among the 6% of German homes with fixed air-conditioning. “And as you get older, the heat gets harder to endure.”