Carbon-credit trading could mushroom into a multi-trillion dollar marketplace <A HREF="http://www.marketwatch.com/news/story/carbon-trading-looms-profits-risks/story.aspx?guid=%7B268F08ED%2D90C5%2D46B1%2DA967%2D71971352FF49%7D" target="_blank">http://www.marketwatch.com/news/story/carbon-trading-looms-profits-risks/story.aspx?guid=%7B268F08ED...</A>