Nobody can own the natural heritage of this planet, but a small number of people can sure have a big influence on it, direct or indirect, positive or negative. If you do make it to the MAFF site there is a Stewardship subsidy, but it's adrift in a sea of yield-linked subsidies. Too little, but hopefully not too late. Make this an international, not a national or regional, responsibility . The consumer has an equal responsibility.
City dwellers have gardens - they are individually a tiny area, but the sum of the parts is great.
Going organic on that small a level can have a direct effect on wildlife. Marginal areas in cities are oases of wildlife waiting to happen. Preserving biodiversity should be a guiding principle, not an added extra. We are all responsible for protecting, or destroying, the ecosystem in which we live.