Global money managers and companies are rushing to meet a deadline to report on their carbon footprint, but the lack of a standard metric raises concerns their efforts could just be a box-ticking exercise in the transition from brown to green. From 2020, firms with some $118-trillion of funds under management – among 800 signatories to a United Nations pact – will make climate-risk related disclosures as an early step towards making the world a better place by 2030.