I have used this example once before I think: above, The Wenzhou World Trade Centre on a clear day. Below, the same building today, ugh.
I had a class a few days ago which was centred around the environment. I asked my student if he knew which cities were the top pollutants in the world. This young man was clever, talkative, and inquisitive, so I thought he would know for sure. Actually, he didn't. He told me an answer which I have heard all too many times since I started working at Web: "To be honest, I think London is the most polluted city". He explained to me his reasons why, which were all correct -- if we were still in Victorian times. I told him it is not like that now at all, but he insisted that it is because of the 2012 Olympics, so the government are moving away all of the factories from the city. This highlighted to me how, once again, many people have been misinformed on basic facts.