agricultural revolution- The development of crop and animal raising as a food source among human communities to supplement hunting and gathering conservation- Sensible and careful use of natural resources by humans. People with this view are called conservationists. conservation biologist- Biologist who investigates human impacts on the diversity of life found on the earth (biodiversity) and develops practical plans for preserving such biodiversity. conservationist -Person concerned with using natural areas and wildlife in ways that sustain them for current and future generations of humans and other forms of life ecologistenvironment. Biological scientist who studies relationships between living organisms and their environmental movement Efforts by citizens at the grassroots level to demand that political leaders enact laws and develop policies to curtail pollution, clean up polluted environments, and protect pristine areas and species from environmental degradation. environmental scientist Scientist who uses information from the physical sciences and social sciences to understand how the earth works, learn how humans interact with the earth, and develop solutions to environmental problems. environmentalist Person who is concerned about the impact of people on environmental quality and believe that some human actions are degrading parts of the earth's life-support systems for humans and many other forms of life. EPA frontier environmental worldview People who get their food by gathering edible wild plants and other materials and by hunting wild animals and fish. hunter-gatherers Survived by collecting edible wild plant parts,hunting fishing, and scavenging meat from animals killed by other predators industrial-medical revolution Use of new sources of energy from fossil fuels and later from nuclear fuels, and use of new technologies, to grow food and manufacture products. information and globalization revolution Use of new technologies to enable people to have increasingly rapid access to much more information on a global scale. preservationist Person concerned primarily with setting aside or protecting undisturbed natural areas from harmful human activities restorationist Scientist or other person devoted to the partial or complete restoration of natural areas that have been degraded by human activities. shifting cultivation abandoned. an agricultural system in which plots of land are cultivated temporarily, then slash-and-burn cultivation Slash and burn is a method of farming that involves clearing land by destroying and burning all the trees and plants on it, farming there for a short time, and then moving on to clear a new piece of land.