The Ecology of Man: An Ecosystem Approach

Africa agriculture air pollution American animals aquatic areas atmosphere become behavior biological biomass birds breeding cattle century changes countries crops cultigens cultivation cultural cycle decline demand density disease domestic early earth ecological economic ecosystems Ecumenopolis effects energy environment environmental erosion estrogenic eutrophication evolution example exploitation factors farm farmers fertilizers fish food chain forest grassland Green Revolution habitat heat herbivores human hydrologic cycle increase industrial lakes land policy limited living major man's materials ment million mineral mongongo nations natural Neolithic nitrogen nutrients ocean oil pollution oligotrophic organic percent pesticides photosynthesis phytoplankton plants Pleistocene population density population growth predators problems production radiation regions result rivers run-off Science Selection snowshoe hare social society soil sources species streams supply surface temperature territory tion trophic levels United urban vegetation wastes wheat Woodwell yield York