Found a study on sociobiology in The Economist (of all places).
This passage on the development of liberal vice conservative tendencies was worth a chuckle:
Dr Wilson and Dr Storm found several unexpected differences between the groups. Liberal teenagers always felt more stress than conservatives, but were particularly stressed if they could not decide for themselves whom they spent time with. Such choice, or the lack of it, did not change conservative stress levels. Liberals were also loners, spending a quarter of their time on their own. Conservatives were alone for a sixth of the time. That may have been related to the fact that liberals were equally bored by their own company and that of others. Conservatives were far less bored when with other people. They also preferred the company of relatives to non-relatives. Liberals were indifferent. Perhaps most intriguingly, the more religious a liberal teenager claimed to be, the more he was willing to confront his parents with dissenting beliefs. The opposite was true for conservatives.
Stressed out, bored, lonely and confrontational. That explains a lot, including the way progressives see environmental issues more often than not as problems rather than opportunities.
Hug your favorite liberal today – they probably need it.
[Don's other habitat is The Evangelical Ecologist]