While annual greenhouse gas (GHG) emissions increased by 60% between 1990 and 2015, the richest 1% of the world's population (about 63 million people) alone were responsible for 15% of cumulative emissions during this period, twice as much as the 3.1 billion people making up the poorest half of the world’s population (responsible for about 7% of cumulative emissions), according to a new report by the NGO Oxfam and the Stockholm Environment Institute (SEI) released on Monday...