Only of concern to those who believe in made made global warming, which I don't. Yes the planet is going through a warming cycle as it has in the past but this is nature at work. To think man is able to control the planet or even have more than a slight effect upon it is really rather big headed. Humankind isn't that great after one small volcanic eruption throws up more CO2 in a day than man can throw out in ten years. A medium one can cause a volcanic winter that last decades. Yeah we could nuke ourselves into extinction along with most other life form on the planet but the earth would heal and carry on without us, without as much as a blink. As you can tell I don't work about carbon footprints I leave behind. And no I don't have a car and I work minimal wage so mining is a chance to dream. Of course in the morning like most dreams I still have to get up and make a living, hehehe