Carbon markets could be a game changer in advancing climate action. But they have to be trustworthy, transparent, result in real climate mitigation and bring tangible benefits, especially for developing countries, if they are to make a real difference. The World Bank Group has been supporting countries by providing technical assistance and financing to enable countries to generate, and now to sell, high integrity carbon credits in the forests and other sectors, and bring benefits to people and communities. Here's how we are scaling up.