Hard Truths - Why science rarely 'wins' on the big things that matter  Climate change is one of those things.  And yet for the last decade or more, there have been endless denials.  For those who would lead (I'm thinking of the growing collection of American bloviators stomping about the U.S. campaign trail) a great start would be admitting that we know precious little about many important things, our climate and oceans included.  Then, maybe, the din of politics would subside for long enough that we could decide what we want to do with what we do know.  This article is a good start.