For example, the ECB could include carbon emission disclosure as a requirement in its asset purchase programmes, to promote transparency and enable adequate risk identification and pricing. Still, the actual contribution of monetary policy to sustainability depends on the climate policy pursued by governments. Effective climate policies will lead to a greater flow of capital towards sustainable economic activities, thereby "greening" monetary operations automatically.
(c)  Prudential issues  The issue of e-money could be a risky business, because the monetary amount stored on a card or on a network is only as good as the bank or other organisation which has the ultimate ability to pay on that obligation. This may not be a serious concern in the case of low-value balances.