The National Climate Assessment is here, and it portends catastrophe; floods, clouds and other assorted weather events are imminent! The United States, it asserts, has already incurred billions of dollars in damages from severe weather-related disruptions because of climate change. But, says the report, "there is still time to act to limit the amount of climate change and the extent of damaging impacts." Environmentalists' political hope is that some of this ugly weather will move President Barack Obama to unilaterally enact carbon dioxide regulations, writes David Harsanyi. But really, after all these years, admitting that executive power is the only way to move (tepidly) forward on climate change policy is basically admitting defeat.