This strategy features in the framework of Agenda 21 as formulated at UNCED (Rio de Janeiro, 1992), now coordinated by the United Nations Commission on Sustainable Development and implemented through national and local authorities.
Nearly two thousand years ago, in the orange groves of China, farmers came up with a new way to deal with insect pests. Beetles, mites, and stinkbugs plagued their trees. Farmers would release ants among the trees, and the ants would dine on the uninvited guests. The farmers knew which species of ants to use - how to breed the ants - and the ideal time of year to put them to work.