The world has had the hottest July on record, leading the UN chief to warn that the era of ‘global boiling’ is here. 

While parts of Australia experienced more mild winter temperatures, searing heat waves are making life difficult across vast swathes of the northern hemisphere. 

Today, a climate scientist on what it means for our summer and whether the extreme conditions can be stopped. 

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Sarah Perkins-Kirkpatrick, Associate professor and climate extremes researcher at UNSW Canberra