It was not until the 1800s that humans began to recognize the existence and role of germs and microbes in relation to disease.

The new municipal statute, however, recognize the existence of other forms of cohabitation, protecting them within the limits set by the legal system.

Most climatologists recognize the existence of various tipping points that push small forcings beyond a certain threshold that makes the change irreversible while the forcings are still in place.

Although pluralism recognizes the existence of inequality, it asserts that all groups have an opportunity to pressure the state.

Basic economic theory recognizes the existence of externalities and their potential negative effects.