The price of petrol
"More on fuel prices" highlighting an NPR report on enviromentalists and higher gas prices.
and "High petrol prices are not a bad thing" with David's commentary on an article in a Sydney newspaper about the issue.
If you haven't yet checked out Oikos you should - it is an insightful disucssion of the economics behind environmental issues. Plus the comments left on his postings usually foster an active dialogue (if not a heated debate) on the topic of the day.