Swiss lender UBS (UBSG.S) said it has tightened its financing criteria for those involved in coal-fired power generation and mining, Arctic oil and tar sands, and would lay out a more detailed climate action plan later this year. UBS was one of a number of banks to sign up to a global initiative launched on Wednesday by UN climate envoy Mark Carney aiming to accelerate efforts by the financial services sector to help decarbonise the global economy. As part of its efforts to get to net zero carbon emissions across its business by 2050, the bank said it would further limit the lending it offers to companies involved in the most-contentious areas of the fossil fuel industry. For companies already involved in coal-fired power generation, UBS said on Thursday it would only lend if they relied on coal for less than 20% of their energy, down from 30% previously. […]