What is Pollution?
Carbon dioxide, a greenhouse gas, is the main pollutant that is warming Earth. Though living things emit carbon dioxide when they breathe, carbon dioxide is widely considered to be a pollutant when associated with cars, planes, power plants, and other human activities that involve the burning of fossil fuels such as gasoline and natural gas. In the past 150 years, such activities have pumped enough carbon dioxide into the atmosphere to raise its levels higher than they have been for hundreds of thousands of years.
Water pollution is usually caused by human activities. Different human sources add to the pollution of water. There are two sorts of sources, point and nonpoint sources. Point sources discharge pollutants at specific locations through pipelines or sewers into the surface water. Nonpoint sources are sources that cannot be traced to a single site of discharge.
Examples of point sources are: factories, sewage treatment plants, underground mines, oil wells, oil tankers and agriculture.
Examples of nonpoint sources are: acid deposition from the air, traffic, pollutants that are spread through rivers and pollutants that enter the water through groundwater.
Nonpoint pollution is hard to control because the perpetrators cannot be traced.
Read more: http://www.lenntech.com/water-pollution-faq.htm#ixzz2ilJCEphA
Water pollution is any chemical, physical or biological change in the quality of water that has a harmful effect on any living thing that drinks or uses or lives in it. When humans drink polluted water it often has serious effects on their health. Water pollution can also make water unsuited for the desired use.
Junk Needs Clean Up, Scientists Say!
Ways to Reduce Air Pollution
- Conserve energy - turn off appliances and lights when you leave the room.
- Connect your outdoor lights to a timer or use solar lighting.
- Lower the thermostat on your water heater to 120F.
- Wash clothes with warm or cold water instead of hot.
- Buy green electricity-produced by low-or even zero-pollution facilities.
What Can We Do About the Space Junk Problem?
Guest contributor and spaceflight expert Lucy Rogers investigates the space debris problem and discusses how we could reduce, reuse and recycle.
We have been polluting space since Sputnik first orbited the Earth in 1957. For many years we have ignored it
Collisions between space debris and satellites threaten many of the systems we use in our daily lives, from financial transactions to weather reports, live television news reporting to air traffic control. If nothing is done soon, we will no longer have safe corridors to space, and critical low-Earth orbits will become unusable.
Ways to reduce water pollution
- Conserve water by turning off the tap when running water is not necessary. This helps prevent water shortages and reduces the amount of contaminated water that needs treatment.
- Be careful about what you throw down your sink or toilet. Don’t throw paints, oils or other forms of litter down the drain.
- Don’t throw litter into rivers, lakes or oceans. Help clean up any litter you see on beaches or in rivers and lakes, make sure it is safe to collect the litter and put it in a nearby dustbin.
- By having more plants in your garden you are preventing fertiliser, pesticides and contaminated water from running off into nearby water sources.
- Take great care not to overuse pesticides and fertilisers. This will prevent runoffs of the material into nearby water sources.