Environmental Science examines the physical, chemical, and biological components of the Earth’s environment, its diverse systems, and the complex ways in which they interact. Environmental scientists use a variety of scientific and analytical techniques to measure environmental parameters, to evaluate the state of environmental systems, and to project the changes in environmental systems as a result of human activities and climate change. Natural and physical systems behavior is key to evaluating the implications of human activities such as agriculture, industry, and resource extraction, processing, and use. Environmental problems such as contamination and pollution, global warming, and biodiversity loss are studied with regard to past, present, and future practices and solutions.