In 2004, it was less than $300 million. But in 2005, the trade really started to soar, ending the year with $10.8 billion-worth of transactions. A year later, in 2006, the "carbon" market had grown to $31 billion. In 2007, again it more than doubled its turnover, to $64 billion. Last year, it did it again, reaching a colossal $126 billion. By 2020, some estimates suggest the annual value will reach $2 trillion.
Not only does this represent a very significant business volume, its stunning growth rate makes carbon trading the hottest item in town, with banks, financial houses and independent brokers piling in to make a killing.