Gerard Wynn and Gabriela Baczynska: Brazil ruled out on Thursday letting rich countries offset their greenhouse gas emissions by helping to save the Amazon rain forest, an idea under active discussion by the European Union. Indigenous peoples attending United Nations-led climate talks in Poznan protested that they had no chance of seeing such carbon cash, and appealed instead for money first to root out corruption and cement their land rights. The global carbon market works by putting a cap on greenhouse gases in …