We've updated the way we do RSS feeds here at WorldChanging.
If you use a news aggregator and wish to see just the headline and the first 25 words of a link, use the RSS 1 (RDF) link. If you want to see the full text -- including links and images -- use the RSS 2 (XML) link.
If you read WorldChanging by actually coming to the site and reading it, continue as you were.
Update: If you were having problems with the RSS 2 (XML) feed, the error has been fixed. If you weren't, never mind.