WA today: IT’S a cruel irony that the air-conditioners we’re increasingly using to keep us cool during the heatwave are creating massive volumes of greenhouse gases, which will exacerbate global warming. Take January 29, for example, when the mercury soared into the mid-40s. Victorians’ use of private air-conditioners on that day alone produced about the same amount of greenhouse gas emissions as 11,000 cars create in an entire year: enough to fill 1.06 billion “black balloons” from the …