A Grexit poses one of three major risks for global economic stability warns credit ratings agency Standard & Poor’s in a report published Tuesday. The report underlines that the threats to global geopolitical stability in the 1st quarter of 2015 have increased, underlining that the total of downgrades (244 issuers) have by far surpassed that of upgrades (125 issuers) over that same period.  The analysts of the agency also note the dangers of the negative economic fluctuations in the Chinese markets as one of the big problems that would affect economic instability.