As the main financier of the French and European economies, banks play a key role in financing the transition. Their current contribution in France is in the order of 8 billion euros per year, but this will need to more than double according to estimates by I4CE1. To accelerate this shift for banking institutions and to prevent their increasing exposures to climate risks, the debate has tended to revolve around whether or not there is a need to reform prudential requirements. The purpose of these requirements is to safeguard financial stability and to protect banks in crisis situations, by obliging them to hold reserves against different risks. There are two conflicting positions on climate issues, between those in favour of a Green Supporting Factor (GSF) and those who advocate a Penalising Factor (PF).