Boston Globe: Natures signals are changing American minds about the risks of climate change. But Washingtons minds are lagging, despite President Obamas stirring call to action in his inaugural speech. The best hope for achieving the transition to a low-carbon economy is through innovation to reduce the costs of new energy technologies. Energy markets left to themselves will discount climate-change risks, so public action to encourage these innovations is needed. But public action does not mean putting government...