If you’ve taken an airline flight recently, you may have noticed the airline offers to offset the carbon emitted during your flight for a small fee. …Environmentalists are not enthusiastic about carbon offsets. The first generation offsets were a huge disappointment. …Because of stricter certification, credits today are more trustworthy, but it’s still a work in progress. Then there’s the fact there’s no way around your flight generating real carbon emissions. …However, the voluntary carbon market (the one you participated in when you bought your flight) is expected to grow to $10 to $40 billion (US) by 2030. Why? Offering carbon credits provides investments for new technologies and for technology transfer to developing nations. …Carbon credits can be traded like stocks. A full carbon market can include all of the complex and risky vehicles available in the stock market.