In 2008, when Groom Energy named and published the first report on “Enterprise Carbon Accounting” (ECA) the corporate world was just starting to track their GHG emissions as a new metric for their company’s sustainability efforts. The financial markets hadn’t yet collapsed and EHS managers were using speadsheets to build GHG baselines and begin regular reporting to the EPA’s Climate Leaders and the Carbon Disclosure Project. We tracked initially 40, and later 75, software vendors with GHG tracking and reporting solutions for this new market.