But the drop-in-the-bucket issue is not the only problem lurking behind the “why bother” question. Let’s say I do bother, big time. I turn my life upside-down, start biking to work, plant a big garden, turn down the thermostat so low I need the Jimmy Carter signature cardigan, forsake the clothes dryer for a laundry line across the yard, trade in the station wagon for a hybrid, get off the beef, go completely local. I could theoretically do all that, but what would be the point when I know full well that halfway around the world there lives my evil twin, some carbon-footprint doppelgänger in Shanghai or Chongqing who has just bought his first car (Chinese car ownership is where ours was back in 1918), is eager to swallow every bite of meat I forswear and who’s positively itching to replace every last pound of CO2 I’m struggling no longer to emit. So what exactly would I have to show for all my trouble?—Why Bother?