Reuters: The European Commission agreed on proposed legislation on Wednesday to force down emissions of carbon dioxide (CO2) from cars with steeply rising fines on manufacturers that fail to comply, an EU source said. The European Union executive set a four-year phase-in period for fines on manufacturers whose fleets exceed an average of 120 grams per km of the main greenhouse gas blamed for global warming from 2012. Fines on companies for non-compliance will start at 20 euros ($28.80) …