In 2011, a Swiss company called World Markets AG bought five million “carbon benefit units”. They came from the April Salumei REDD project in Papua New Guinea. World Markets sold the “carbon benefit units” at a profit of over US$5 million.
There are many reasons not to buy voluntary carbon credits as an investment. The price is likely to fall over time. There is no secondary market. And you’re more than likely to be ripped off when you buy carbon credits.