Reminds me of "global dimming", which <i>may</i> counteract global warming. BBC Horizon had an episode about it a long time ago.<p>> Global dimming also creates a cooling effect that may have partially counteracted the effect of greenhouse gases on global warming.<p><a href="https://en.wikipedia.org/wiki/Global_dimming" rel="nofollow">https://en.wikipedia.org/wiki/Global_dimming</a>