Business Green: Carbon research firm CO2Benchmark will next week launch a new online carbon benchmarking tool, designed to help businesses and green consultants easily compare the environmental performance of those companies that publicly release carbon data. The tool, which is currently in beta and will be officially launched at the Sustainabilitylive! Show in Birmingham next week, is based on emissions data from 2,500 organisations from 20 countries and allows users to search the data and compare …