Smog Fog

An article on Yahoo this morning also claimed that sevearl nations tests support that the climate changes causing global warming are man-made thanks to things like factories, cars, etc. The only trouble I have with that theory is that great climate shifts have occurred before. LONG before man came on the scene, and definately before there were ever any factories. I simply don't recall seeing any cars speeding through the landscape in any pictures of the time just before the ice age.