A tale of two cities: Vancouver at 8:20 am PST this morning, absolutely sweltering beneath the smoggy "heat dome" that brought record-breaking temperatures yesterday and today. (Lytton, BC today recorded the hottest temperature ever recorded in Canada: 47.5 C / 117.5 F). And Toronto 4 hrs. later at 3:30 EST, the city nicknamed "the Big Smoke" on a beautifully clear summer day. The temperature was a reasonable 27 C / 80.6 F when I landed. When you fly across the country in a p…