Resource efficiency is the maximising of the supply of money, materials, staff, and other assets that can be drawn on by a person or organization in order to function effectively, with minimum wasted (natural) resource expenses. It means using the Earth's limited resources in a sustainable manner while minimising environmental impact. Natural resource efficiency is embedded into the work of initiatives like the United Nations Environment Programme (UNEP) and international strategies such as the European Union's "Green Deal".[1]