A coalition of U.S. investors [Ceres] put companies…on a "Climate Watch" list…claiming the long-term competitiveness of the firms could be hurt by their lack of action on climate change…Ceres said Exxon Mobil Corp has been "unresponsive to investor requests for a decade," on strategies on growing demand for diversified clean energy sources. Exxon spokesman Chris Welberry said in a email, "We reject this criticism,"...Ceres put Massey Energy on the list, saying it had resisted shareholder resolutions requesting the company develop and disclose a strategy for responding to climate change. The company did not immediately return a request for comment…Ceres… have filed 63 global warming resolutions with the nine companies on the climate list…The group also targeted companies investing in Canada's tar sands, including Chevron Corp…and Canadian Natural Resources…Canadian Natural management could not be immediately reached and Chevron did not immediately return phone calls about the investments.