There lies a collective awareness on the urgency in getting involved with and influencing current environmental issues and climate change in today’s society. This phenomenon is known by the general public as: Greening. It is important, for museums to participate in this occurrence any way possible. To be able to sustain the quality and quantity of our cultural heritage, museums must take matters into their own hands. Visitors (and sponsors) will start demanding it from them. But the real reason museums should start Greening their museums has less to do with a demand from the outside world and far more to do with two essential aspects: an ethical and a financial essence of sufficient and sustainable museum management practice.