Is this truly a global effect, or is it a local effect due to Chinas pollution? If indeed it is a global effect, is it the cause of pollution, or a warming trend caused by the Earth still recovering from the last Ice Age as has been postulated? I'm not trying to talk out of both sides of my mouth, but rather trying to initiate a valid discussion. Those who started warning about global warming at first, put sole blame on increased greenhouse gasses (CO2 and the like) starting to hold in more of the heat we get from the sun. A very small (but rapidly growing) theory is that the last Ice Age was not truly over and the warming had only stalled for a few centuries, indeed the warming trend reversed for a time causing the Potato Famine in Ireland, and spurring a massive influx of immigration to the U.S. a hundred and fifty years ago or so. Any thoughts?