Seventy Seventh Discovery Posting:
This is the first posting on a more general environmental issue: Global Dimming.
The rational behind this posting is that this is something new which I had discovered, and you might be wondering how is this related to any environmental issue.
Think global warming.
Here's a spoiler, it has to do with the sun as well.
Anyway, I don't believe I can present this topic better than the video which I learned about global dimming from. Another reason why I chose to embed this video (below) is because the introduction and discussion of this issue was done quite comprehensively (personal opinion) in this video.
For your information, the embedded video is a program on Global Dimming from "BBC: Horizons" and lasts about 45 minutes.
If you find that you do not have 45 minutes to spare to learn about global dimming, visit this link: http://www.bbc.co.uk/sn/tvradio/programmes/horizon/dimming_prog_summary.shtml to read a summary of the video.
Enjoy the video, discoverers.
Do give some thought to the issue of global dimming after watching or reading about it. =)