Environmental sciences is a interdisciplinary academic field that draws on ecology, geology, meteorology, biology, chemistry, engineering, and physics to study environmental problems and human impacts on the environment. Environmental science is a quantitative discipline with both applied and theoretical aspects and has been influential in informing the policies of governments around the world. Environmental science is considered separate from environmental studies, which emphasizes the human relationship with the environment and the social and political dimensions thereof. Whereas, environmental studies might focus on the economic and political dimensions of international climate-change protocols, an environmental scientist would seek to understand climate change by quantifying its effects with models and evaluating means of mitigation.