Yes, I did.
I was fortunate to fly in the same month, October, in 1992 and then again in 2006. As you know, seasonal changes are still larger than the yearly climatic changes that we're seeing, and so having the privilege of flying in the same month allowed me to see the climatic changes and not just the seasonal changes.
The amount of ice in the mountains all over the world is substantially reduced. I was so impressed with that reduction that I went and got RADARSAT data from 1995 and RADARSAT data from 1996 and used the software to see how much the ice has been reduced. The tongues of the Columbia Icefields, for example, are reduced by two to three kilometres depending on where you are.
Pollution indexes were visible to the naked eye. Back in 1992, China was dirty at the centre of Beijing, for example. The air was dirty. Now the entire region is dirty. I just came back from China, and it's a major problem for them over there. I saw that with my own eyes, but we have satellites that measure that as well and have been collecting data. It's a system called MOPITT. It's been collecting data for 10 years, and it shows that there is a substantial increase of this local pollution in China. What's interesting, though, is that it also shows the upward transport phenomenon that takes it up over the north. That local pollution problem is causing a pretty substantive problem in our north.
So yes, those changes are evident.