Reuters: Italian energy company Eni’s (ENI.MI: Quote, Profile, Research) enthusiasm for the Canadian oil sands sector is waning, its chief executive said on Tuesday, citing high costs and environmental concerns. "While a year ago, we would have told you that we are looking deeply into it, now we are somewhat cooling off," Paolo Scaroni told reporters after Eni entered into a research agreement with the Massachusetts Institute of Technology in Cambridge, Massachusetts. Canada’s …