Heatwave trends accelerate worldwide Phys.orgHeatwaves have become longer in most of the world since 1950s – study The GuardianHeatwaves increased in frequency and duration since 1950s Daily MailThe world endured 2 extra heatwave days per decade since 1950 – but the worst is yet to come Phys.orgHeatwave alert: Hot weather trends have 'accelerated' in past 70 years - climate study Express.co.ukView Full Coverage on Google News