Mr. da Silva, a former factory worker, said wealthy countries should switch to nonfossil fuels, such as ethanol or biodiesel, an area where Brazil is a pioneer.

• 以前曾是工厂工人的德-席尔瓦先生说富国应当迅速采用像乙醇或生物柴油这样的非化石燃料，这方面巴西是个先驱、倡导者。