Tonight will witness Earth Hour, when millions of people will switch off their lights to demonstrate their solidarity with, em, Gaia apparently. As usual with these things, North Korea has put Ireland to shame. They don't just do Earth Hour once a year, they do it every night. Theirs is the low carbon, low energy, low everything way of life that we should all aspire to.
Or maybe not. Just by coincidence, tonight will also witness Human Achievement Hour, when billions of people will leave their lights on to celebrate the extraordinary gift of human innovation, imagination and productivity. Here's a little video from last year that helps put things in perspective: