The Commonwealth has admitted French-speaking Rwanda as its 54th member in the latest expansion of the geographically diverse group of mostly former British colonies, Reuters quoted a spokesman as saying today. The decision to let the Central African country join was taken by leaders of the Commonwealth, which is headed by Britain"s Queen Elizabeth, at a summit in Trinidad and Tobago. The three-day meeting focused mainly on forging a consensus among the group"s more than 50 members on firm commitments and strategies for fighting global warming that could be brought to U.N. climate talks in Denmark next month. The talks are aimed at cementing a binding international climate accord.