Pressure on oil companies is building after an activist group filed a shareholder resolution urging BP to set hard targets for reducing overall carbon emissions. "Follow This," a Dutch group that accumulates shares in oil companies in order to press them over greenhouse gases, has already spearheaded a number of climate shareholder resolutions at Royal Dutch Shell (RDS.A, RDS.B) and may also target Chevron ( CVX ) and Exxon Mobil ( XOM ).