(TomDispatch.com) -- The first horseman was named al-Qaeda in Manhattan, and it came as a message on September 11, 2001: that our meddling in the Middle East had sown rage and funded madness. We had meddled because of imperial ambition and because of oil, the black gold that fueled most of our machines and our largest corporations and too many of our politicians. The second horseman came not quite four years later. It was named Katrina, and this one too delivered a warning.
Katrina’s message was that we needed to face the dangers we had turned our back on when the country became obsessed with terrorism: failing infrastructure, institutional rot, racial divides, and poverty. And larger than any of these was the climate -- the heating oceans breeding stronger storms, melting the ice and raising the sea level, breaking the patterns of the weather we had always had into sharp shards: burning and dying forests, floods, droughts, heat waves in January, freak blizzards, sudden oscillations, acidifying oceans.