Silver linings to higher gas prices

from Foreign Policy (via Greg Mankiw):

1. Boom in mass transit
2. Lower obesity
3. Fewer accidents
4. Less commuting traffic
5. Increased biofuels usage in response to subsidies

Of course, points .2. and .3. will just lead to more carbon emissions from healthier and longer-living people. But .5. will result lead to greater starvation, as farmlands will be yielding fuel instead of food, so I guess that's an offset.