An ecologist is a scientist who studies the relationship between living organisms and their environment. As such, an ecologist's concern would include OZONE, CLIMATE, SMOG, FLORA, and global warming. OZONE is a form of oxygen that is found in the Earth's atmosphere and is important for protecting the planet from harmful ultraviolet radiation. CLIMATE refers to the average weather conditions of a particular region over a long period of time. SMOG is a type of air pollution caused by the burning of fossil fuels. FLORA refers to the plants of a particular region or habitat. Global warming is the gradual increase in the average temperature of the Earth's atmosphere due to the emission of greenhouse gases.