Ecocentric: While the national government remains slow to deal with climate change, many cities have been moving ahead. Why the difference? Well, cities tend to be more homogenous politically, which makes any kind of decisive action easier to push through. But the real reason is that city managers know that they will be the first ones forced to deal with the likely consequences of global warming: rising sea levels and flooding, deadly heat waves and water struggles. New York City didn`t just come out last week...