Presentation on theme: "Remember - “you and I can decide the future”"— Presentation transcript:
1 Remember - “you and I can decide the future” E-Weekly-5/35Green Earth MovementAn E-Newsletter for the cause of Environment, Peace, Harmony and JusticeRemember - “you and I can decide the future”G E M
2 Water is essential to life Water is essential to life. It need not be spelt out exactly how important it is. Yet water pollution is one of the most serious ecological threats we face today.
3 Water pollution occurs when a body of water is adversely affected due to the addition of large amounts of materials tothe water. Thesources of waterpollution arecategorized asbeing a pointsource or anon-source pointof pollution.
4 Point sources ofpollution occur whenthe polluting substanceis emitted directly intothe waterway. A pipespewing toxic chemicalsdirectly into a river is an example.A non-point source occurs when there is runoff of pollutants into a waterway, for instance when fertilizer from a field is carried into a stream by surface runoff.
5 Not only does this spell disaster for aquatic ecosystems, the pollutants also seep through and reach the groundwater, whichmight end up in ourhouseholds ascontaminated waterwe use in our dailyactivities, including drinking.
6 Types of Water Pollution 1] Toxic Substance -- A toxic substance is a chemical pollutant that is not a naturally occurring substance in aquatic ecosystems. The greatest contributors to toxic pollution are herbicides, pesticides and industrial compounds.
7 2] Organic Substance Organic pollution occurs when an excess of organic matter, such as manure or sewage, enters the water. When organic matter increases in a pond, the number of decomposers will increase. These decomposers grow rapidly and use a great deal of oxygen during theirgrowth. This leads to adepletion of oxygen as thedecomposition process occurs.A lack of oxygen can kill aquaticorganisms. As the aquaticorganisms die, they are brokendown by decomposers which leads to further depletion of the oxygen levels.
8 3] Thermal Pollution Thermal pollution canoccur when water isused as a coolant neara power or industrialplant and then isreturned to the aquaticenvironment at a higher temperature than it wasoriginally. Thermal pollution can lead to a decrease in the dissolved oxygen level in the water while also increasing the biological demand of aquatic organisms for oxygen.
9 4] Ecological Pollution Ecological pollution takes place when chemical pollution, organic pollution or thermal pollution are caused by nature rather than by human activity. An example of ecological pollution would be an increased rate of siltation of a waterway after a landslide which would increase the amount of sediments in runoff water.Another example would bewhen a large animal, such asa deer, drowns in a flood anda large amount of organicmaterial is added to the wateras a result. Major geologicalevents such as a volcano eruption might also be sources of ecological pollution.
10 Specific Sources of Water Pollution 1] Farming Farms often use large amounts of herbicides and pesticides, both of which are toxic pollutants. These substances are particularly dangerous to life in rivers, streams and lakes, where toxic substances canbuild up over a period of time. Farms also frequently use largeamounts of chemical fertilizersthat are washed into thewaterways and damage the watersupply and the life within it.Fertilizers can increase the amounts of nitrates and phosphates in the water, which can lead to the process of eutrophication.
11 2] BusinessClearing of land can lead to erosion of soil into the river. Waste and sewage generated by industry can get into the water supply, introducing large organic pollutants into the ecosystem. Many industrial and powerplants use rivers, streams andlakes to dispose of waste heat.The resulting hot water cancause thermal pollution.Thermal pollution can have adisastrous effect on life in an aquatic ecosystem as temperature increases decrease the amount of oxygen in the water, thereby reducing the number of animals that can survive there.
12 3] HomesSewage generated by houses or runoff from septic tanks into nearby waterways, introduce organic pollutants that can cause eutrophication. Fertilizers, herbicides andpesticides used for lawn carecan runoff and contaminatethe waterway.As with agricultural fertilizers,home fertilizers can lead to theeutrophication of lakes and rivers. Improper disposal of hazardous chemicals down the drain introduce toxic materials into to the ecosystem, contaminating the water supplies in a way that can harm aquatic organisms.Leaks of oil and antifreeze from a car on a driveway can be washed off by the rain into nearby waterways, polluting it.
13 How are pollutants transported through water? Pollutants can exist in water in different states. They can be dissolved or they can be in suspension, which means that they exist in the form of droplets or particles. Pollutants can also be dissolved in dropletsor absorbed by particles.All states of pollutantscan travel greatdistances through waterin many different ways.
14 In lakes and oceans pollutants are transported through currents In lakes and oceans pollutants are transported through currents. There are many currents in the oceans, which are wind-driven. This enables a pollutant to travel from one continent to another. We usually count on the abilityof the oceans to reducepollutants in concentration, theso-called 'self-cleaning ability' ofoceans. But this does not alwayswork, because the movement ofthe currents in the oceans is notuniform. This causes inshore waters to often have substantially higher levels of pollution than the open sea. When persistent pollutants accumulate in fish or sea birds they cannot only become a toxic danger to aquatic food chains, they can also travel great distances within these animals and end up in the food chains of non-polluted areas.
15 STOP WATER POLLUTIONDealing with waterpollution is somethingthat everyone (includinggovernments and localcouncils) needs to getinvolved with. Here are afew things you can do tohelp. Learning about theissue (like you are doing) is the greatest and most important step to take. Here are a few more:
16 1] Never throw rubbish away anyhow 1] Never throw rubbish away anyhow. Always look for the correct waste bin. If there is none around, please take it home and put it in your trash can. This includes places like the beach, riverside and water bodies.
17 2] Do not throwchemicals, oils, paintsand medicinesdown the sink drain,or the toilet. In manycities, your localenvironment officecan help with the disposal of medicines and chemicals. Check with your local authorities if there is a chemical disposal plan for local residents.
18 3] Buy more environmentally safe cleaning liquids for use at home and other public places. They are less dangerous to the environment.
19 4] If you use chemicals and pesticides for your gardens and farms, be mindful not to overuse pesticides and fertilizers. This will reduce runoffs of the chemical into nearby water sources. Start looking at options of composting and using organic manure instead.
20 5] If you live close to a water body, try to plant lots of trees and flowers around your home, so that when it rains, chemicals from your home does not easily drain into the water.
21 Governments, local councils and laws Many governments have very strict laws that help minimize water pollution. These laws are usually directed at industries, hospitals, schools and market areas onhow to dispose, treatand manage sewage.Do you know thelaws in your country?This is the time tofind out.
22 In many developed cities, waste or sewage treatment is very efficient, and designed to minimise pollution of water bodies.There are also lots oforganizations and groupsthat help educate peopleon the dangers of waterpollution. It is always greatto join these groups, becausethey regularly encourageother members of their communities to have a better attitude towards water.
24 These PPTs may be downloaded from our website This educational PowerPoint Presentation (editable) is prepared by GEM Team (courtesy: internet).For other similar GEM PowerPoint Presentations on various environmental issues see next slide.These PPTs may be downloaded from our websiteThe GEM PPTs can be creatively used for various groups like school/college students, NGOs, government officials, Church groups, SCC groups, housing society members and so on.
25 Zero Garbage Genetically Modified Foods Waste Water Treatment Solar Energy -(Darkness to Light)Junk FoodTwenty Tips To Save NaturePlastic – a boon or bane?Green PassionSoft drink – A Health HazardWaste to energyRain Water HarvestingEco-friendly ReligionsHappy Green DiwaliClimate ChangeThe future of BiodiversityGenetically Modified FoodsWaste Water TreatmentGive thanks, Give Life (Body, Organ, Tissue Donation)Organic FarmingWaste to cooking gasReduce, Reuse. RecycleProtect MangrovesSay NO to Bottled waterSave Lakes and Ponds Forests are green lungsCoal Mining and EcologySin of Food WasteClimate change and PovertyStop Water Pollution