A parade of unprecedented heat waves is the likely cause. (robertscribbler.com)
I have to say that it takes a special sort of studied obtuseness to look at all the events we are hearing about — unprecedented heat waves in Russia, flooding in Oz, S. America, etc. and say «Meh!» (realclimate.org)
Moscow, which has already recorded unprecedented heat waves this century, will experience permanent change in 2063. (climatenewsnetwork.net)