By Valerie Volcovici, Gloria Dickie and William James DUBAI (Reuters) -Representatives from nearly 200 countries agreed at the COP28 climate summit on Wednesday to begin reducing global consumption of fossil fuels to avert the worst impacts of climate change, a first of its kind deal signaling the eventual end of the oil age. The deal struck in Dubai after two weeks of hard-fought negotiations was meant to send a powerful signal to investors and policy-makers that the world is now united in its desire to break with fossil fuels, something scientists say is the last best hope to stave off clima…