Higher temperatures due to human activity making heatwaves more likely

Expert says jury is still out on extent to which climate change is affecting the jet stream

Emeritus Professor of Geography in Maynooth University, John Sweeney, has said that climate extremes in the middle and high latitudes could indicate a 'global climate emergency' is on the horizon.

Rising global temperatures caused by human activity are making the heatwaves gripping the northern hemisphere more likely, scientists warn.

Extreme heat has been seen in the northern hemisphere, with temperatures exceeding 30 degrees in the Arctic circle, a deadly heatwave in Japan being declared a natural disaster and heatwaves in parts of North America and Siberia.

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