The Ethics of Chaos

At least two strains of science suggest that we should be confident that every little thing we do, no matter how innocuous and inconsequential it may appear, has vast, far-ranging and in-principle-unknowable effects. So what? Does this make nonsense of an aspiration to improve the world through good work? I say it does not. But it should lead us to rethink the relation between grounds for action and grounds for relief and regret.