Although the rules are not bulletproof against greenwashing, they do offer a model for corporate climate plans. With the right kind of oversight, credits in these markets may end up being more robust than present-day offsets. Truly climate-conscious companies may scrap their old-school reliance on dubious offsets, and refocus their actions around reducing their own emissions, buying more effective credits, and “contributing” to emissions reductions elsewhere. And although the UN has no direct power over the existing, $2 billion private carbon credit market, the rules that take shape here will send an important signal to that market about what governments view as credible.