The day forecasters can give me a 100% weather forecast, is the day I'll believe global warming etc.
I'm pretty sure that all the cars, houses, factories are contributing to all the crap thrown into the atmosphere. Is that causing global warming or is just a cycle? 10,000 year cycle, 50,000 year cycle etc. No clue.
I do remember hearing a story about a few astronauts either recently gone into outerspace or seen photos. They say that the view is less clear than it used to be. All the pollution, etc must be having some sort of effect.