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nonpoint source Air pollution in Los Angeles is what type of source natural resource Occurs naturally in the environment and is used by people pollution global environmental scientists Contamination of Earth’s land, water, or air Decisions about how to protect Earth’s atmosphere are made on what level Who provides the data that is considered when resolving an environmental issue population growth pollution resource use population growth environmental pollution What causes a demand for resources to grow Three general categories of environmental issues What type of proposals have costs and benefits that are often economic Can be grouped in two categories, point source and nonpoint source Fresh water is what type of resource natural resource survival and development conservation high level of resource use sustainable use renewable resource Humans depend on natural resources for what two reasons Allows resources to last longer What makes a larger ecological footprint Using a resource in ways that maintain the resource at a certain quality for a certain period of time Resources that are replaced as fast as they are used oil and coal health and disease Natural resources that were formed over millions of years Determines a population’s life or death Today’s human population of Earth more than 7.1 billion disagree Experts agree or disagree over whether the human population will stop growing yes Do people live longer in most areas of the world today than ever in human history exponential growth medicine and technology natural resources yes fishery Occurs when a population grows at an ever-increasing rate Advances in what have improved human health and allowed for tremendous population growth As the human population grows, the demand for what increases If population and the demand for natural resources continue to grow, will the human population be too large for Earth to support An area with a large population of valuable ocean organisms aquaculture new trees can be planted to replace trees that are cut down selective cutting Raising water-dwelling organisms for food in an artificial pond Why can forests be renewable resources Cutting down only some trees in a forest setting fishing limits Approach to managing fisheries that can involve banning or restricting fishing of certain species to manage resources for a sustainable yield Fishing methods like poisoning fish with cyanide are outlawed for what reason erosion they produce oxygen and absorbing carbon dioxide 1/3 One disadvantage of clear-cutting How trees help other organisms What percentage of the US land area is made up of forests habitat destruction Major cause of extinction threatened species Species that could become endangered in the near future Endangered Species Act protecting whole ecosystems biodiversity keystone species climate, area, and diversity Prohibits trade or products made from threatened or endangered species The most effective way to preserve biodiversity Has both an economic and ecological value within an ecosystem Influences the survival of many other species in an ecosystem Ex. sea otter Affect biodiversity in an ecosystem rain forests The most diverse ecosystems in the world habitat destruction hunting How can people directly cause the extinction of some species