BusinessGreen: Nearly 800 investors have joined together to demand oil and gas companies reveal the devaluation risks their assets could face as a result of tough action on climate change to curb rising carbon emissions. For the first time this year non-profit organisation CDP, representing 767 investors who combined hold more than a third of the world's invested capital, will ask oil and gas companies to reveal their exposure to potentially unburnable fossil fuels. CDP's 2014 Climate Change Information Request,...