Financial Times: It’s been a strange year in Harlem. The robins didn’t migrate. The hyacinths popped up in the snow. And then tropical intruders took over the garden. This global warming is getting out of control. It’s not that it happened all of a sudden. For some time I had noticed climatic changes in the backyard of our New York brownstone. The forsythia had not flowered for several springs. Each autumn we spotted fewer bird species flying south. And then there was that hothouse orchid that someone …