Two decades ago, when the euro was created and pan-European markets were formed, foreign languages became the skill du jour. More recently, Javascript, Python and other programming languages have been the differentiating factors. And now? ESG credentials are becoming the new must-haves for finance jobs. Senior ESG fund managers can earn £500k ($666k) in London. In the U.S., private equity funds and hedge funds are paying seven figures for ESG expertise. ESG jobs are growing rapidly: candidates with the right qualifications are reportedly receiving as many as 25 approaches from headhunters each week. - But which qualifications are they?