It’s Earth Day today, the anniversary of the 1970 event that kick-started the modern environmentalist movement. in her recent column, my colleague Mary Wakefield wrote how a ‘dark green’ orthodoxy of negativity is being taught in schools with kids being given an unduly gloomy view of the world. But that’s perhaps inevitable when the “act or die” message of the original Earth Day is perpetuated even after the arguments behind it have collapsed – without anyone really explaining, or tracking, the new facts.