A good basic site to start looking for lightning information. Many links available.
This site is focused on safety. Prevention is the best approach to lightning safety. Read on!
I think this is the best page on the green flash. Andrew is a physicist who studies atmospheric optics.
This page is provided by Jan Curtis, the premier Aurora photographer in Alaska, and probably the world. There are also many useful links.
This page will show you where the latest earthquakes have been, and how strong they were.
A list of active volcanoes with descriptions of activity.
This is the best place for more detailed weather info. A general user might try intellecast.com.
Finally, I am no expert on Climate Change, but there are experts. If you are interested in the topic, here is a page of links.