Deutsche Bank is implementing a stricter policy for coal financing as part of additional measures to reinforce its net-zero commitment, Germany's top lender said on Thursday, adding that it would also update its oil and gas policy at some point. The bank, however, didn't announce any tighter criteria for oil and gas financing today. It only said it had recently updated its thermal coal policy that lays out the revenue threshold that determines if a corporate client is considered a thermal coal company. Deutsche Bank said it had lowered this revenue…