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Published on March 18, 2018

Author: rossy7379

Source: authorstream.com

Human Impact on the Environment: Human Impact on the Environment Pollution: Pollution What is pollution? Harmful or poisonous substances that dirty the air, water, or land. Pollution can be dangerous to people, plants, and animals. Can you name some of the major types of pollution? Soil pollution Water pollution Air pollution Thermal pollution Have you ever littered? Soil Pollution and Erosion: Soil Pollution and Erosion Did you know that the average person in the United States produces about 1,600 pounds of garbage every year? So il Pollution- Stripping soil of its natural fertility by using artificial chemicals which absorbs nitrogen needed for plant growth Landfills - areas of land where human’s deposit garbage Erosion - when loose soil moves and washes away Caused by human’s cutting down trees and plowing fields or worn away by rain, rivers, and winds. Loose soil being washed away can cloud rivers and prevent organisms such as plankton from receiving sunlight for photosynthesis Erosion results in harmful fertilizers and chemicals from farms being washed into oceans and rivers, affecting entire ecosystems Air Pollution: Air Pollution Air Pollution- contamination of air present in the atmosphere What causes air pollution? Exhaust- waste gases produced by an engine. This partially combusted gas is released from internal combustion engines attributing to poisonous gas into the atmosphere Burning of discarded plastic, wood, and rubber release carcinogenic gases into the atmosphere Some industries release gases like sulfur dioxide and carbon monoxide mix with air and clouds causing acid rain Humans pollute the air when we burn wood or fossil fuels Smog- a combination of smoke and fog. Created when sunlight reacts with air pollutants Power plants that burn coal, natural gas, or bio fuels contribute to air pollution Air Pollution Continued: Air Pollution Continued What are some effects of air pollution? Greenhouse Effect- gases in the atmosphere such as carbon dioxide that trap heat from the sun’s radiation These gases help warm our planet but too much causes our planet to heat up too much Acid Rain- pollutants in the air, such as sulfur and nitrogen oxide from automobile exhaust, react with water in the atmosphere to produce this acidic rain Can destroy plant life by washing away nutrients in the soil Can turn lakes and ponds acidic, which causes fish and other organisms to die Ozone Depletion- when chlorofluorcarbons (CFC) destroy the layer of gas in the atmosphere that protects humans and animals from the sun’s harmful UV rays that cause sunburns and skin cancer CFC’s can leak into the environment from air conditioners, freezers, or aerosol spray bottles Water Pollution: Water Pollution Water Pollution- Involves the contamination of various water bodies Harmful chemicals from our homes, farms, and factories seep into our water sources Sewage - all household waste water. This can get mixed into waterways. Ocean water gets contaminated as rivers and streams flow into oceans, carrying pollutants with them. Oil spills from oil tankers can kill thousands of organisms such as birds and fish Eutrophication - excessive richness of nutrients in a lake or other body of water, frequently due to runoff from the land, which causes a dense growth of plant life and death of animal life from lack of oxygen Dead Zone- An area of water depleted of oxygen where almost no aquatic life can live Link: Water Pollution Video Causes and Effects of Water Pollution Thermal Pollution: Thermal Pollution Thermal Pollution- Rise in the temperature in the ecosystem due to the release of excessive heat energy into the environment by artificial methods or natural disasters Global Warming- a gradual increase in the overall temperature of the earth’s atmosphere generally attributed to the greenhouse effect caused by increased levels of carbon dioxide, chlorofluorocarbons, and other pollutants Global Warming is causing the ice caps to melt, water levels in the ocean to rise, and weather patterns to become more extreme Some manufacturing industries and vehicles with combustion engines release a lot of heat energy Carbon dioxide has a property of blocking heat from exiting the atmosphere, so the heat coming in from the sun is trapped in the atmosphere Learn about Global Warming: Global Warming Video What Human Activities Create Pollution?: What Human Activities Create Pollution? Construction- deforestation and released emissions Farming- pesticides and insecticides Mining- fossil fuels Transportation- combustion engines in motor vehicles Hunting and Poaching- overhunting leading to animal extinction Industry- manufacturing plants releasing poisonous gases such as carbon monoxide and nitrous oxides into the atmosphere Conservation: Conservation What can human’s do to help environmental conservation and reduce pollution? The Three R’s : Reduce, Reuse, and Recycle Reduce : reduce the amount of trash you produce and the amount of energy you consume to conserve natural resources Reuse : purchase products that you can use more than once, try to avoid disposable items that use up natural resources and produce excess trash Recycle : a process that reuses and changes materials into things that can be of use. It saves energy and landfill space and reduces the need for additional natural resources. What can be recycled? Plastic, metal, glass, paper, and compost! Renewable Natural Resources: Renewable Natural Resources Renewable Resources- natural resources that can be recycled or replaced by nature quickly ( aprox . within 100 yrs ) What are examples of renewable resources? Sunlight, Trees, Water, and Wind Advantages? Won’t run out and environmentally friendly Disadvantages? Inefficient and geographically selected What are some renewable energy sources? Biomass, Solar Energy, Hydroelectric Power Stations, Wind Energy, Wave and Tidal Power, Geothermal Energy Non-renewable Natural Resources: Non-renewable Natural Resources Non-renewable Resources- natural resources that can take up to millions of years to replace What are examples of nonrenewable resources? Metals, Minerals, Nuclear Energy, and Fossil Fuels such as coal, crude oil, and natural gas Advantages? Cheap, readily available, multipurpose, and efficient Disadvantages? Polluting or radioactive and running out

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