Greenland is melting for the first time ever... isn't that enough proof that something is amiss? Not to mention the vanishing glaciers world-wide.
But lets say that it is a scam. What are the proponents 'scamming' people for? A better environment? Healthier living? Cleaner and renewable fuels? It is no secret that the exhaust from cars alone impact the health of people. My Aunt and 2 cousins live in Hong Kong, and the air is so bad that they are on constant medication. After coming back to Canada for just a few days, they don't need their inhalers and they can breath normally.