Global warming is the  increase in the average temperature of Earth's  near-surface air and  oceans since the mid-20th century and its projected  continuation. Global surface temperature increased 0.74 ± 0.18 °C  (1.33 ± 0.32 °F) between the start and the end of the 20th  century.
Global warming refers to an increase in the Earth’s  average surface air temperature.  Global  warming and cooling in  themselves are not necessarily bad, since the  Earth has gone through  cycles of temperature change many times in its  4.5 billion years.   However, as used today, global warming usually  means a fast, unnatural  increase that is enough to cause the expected  climate conditions to  change rapidly and often cataclysmically. 
Our planet is  warmed by radiant energy from the sun that reaches the surface through  the atmosphere. As the surface  warms, heat energy reflects back toward  space; meanwhile, gases in the  atmosphere absorb some of this energy and  reradiate it near the surface. This is often called the greenhouse  effect, named for the way heat increases inside a glass enclosure. In  the greenhouse  effect around Earth, the atmosphere can be visualized as a  blanket  that is made thicker by the action of a small amount of water  vapor,  carbon dioxide, methane, ozone, nitrous oxide, other gases, and  soot;  it thus holds in more heat, forcing air temperature higher. The   scientific term for this action is, in fact, “forcing.”
On an average day, this effect is  caused by water  vapor and clouds (75 percent) and carbon dioxide (20  percent), with the  rest fthe heating caused by other gases. Relatively  small additions of  carbon dioxide and methane force more heat, and that  heat allows the air  to hold more water vapor, creating a feedback loop  that magnifies the  effect. Although water vapor is naturally prevalent  in the atmosphere,  it does not trap as much heat per molecule as carbon  dioxide and  methane. Also, water vapor molecules cycle through the  atmosphere in  only a few days, a brief period compared to the residence  time of  CO2,which persists for many decades and creates some warming  even after  as long as three hundred years. Dust and aerosol chemicals  in the air  cause some cooling (negative forcing); they are also very  short lived.   Even though the gases are measured only in parts per  million (ppm) or  billion (ppb), they have been powerfully, and  naturally, influencing the  Earth’s temperature for millions of years.  Without them, instead of an  average air temperature of about 58°F  (14.5°C), the Earth would be below  the freezing point. Life as we know  it now would be impossible.
Earth’s temperature is also subject to  natural forcing cycles  from solar radiation and the movement of the  planet around the sun.  Scientists think these cycles, which have left a  visible signature  extending back millions of years, arewhat led to  past iceages and the  warming that ended them.  Currently, we are in a  period between major  iceages. The last great glaciation, when  temperatures were about 10°to  12°F (6°to7°C) cooler than today, began  fading away about 18,000  yearsago. The initial transition out of the ice age was unstable,with  many rapid temperature shifts. As temperatures warmed, climate was  affected.
Global Warming Prevention
Description of global warming prevention and what can be done by the individual in and around their home to help.
The terms "global warming" and "greenhouse  effect" have become common topics of conversation worldwide. Synonymous  with climate change and pollution, this issue is the contributor for  mass speculation. Every individual has the ability to help ensure the  health of our environment and awareness and education is the first step.  Contrary to popular belief, it is not the sole fault of large  corporations that our environment is in crisis. It is us, the individual  consumer. Without our need and demand, these companies would not be  producing ecologically harmful products. Information is our best defense  and making more environmentally sound decisions our best offense. There  are many substitutes for products and merchandise that would be more  environmentally safe, it is just a matter of knowing what they are.
Chemicals-
Avoid  chlorine at all cost! Use of any chlorine compounds is very harmful to  the environment including bubbles in plastic foam, spray paint, fire  extinguishers, bleach and a multitude of discarded household and  industrial chemicals. Phosphates found in many laundry detergents and soaps contributes to water pollution and should be avoided. Aresols such as air fresheners  and hair sprays can contain butane/pentane which contributes to air  pollution and should be avoided. What out for products that are  "bleached" white (ie.baby wipes, writing paper) and look for companies  that offer the same products which are whitened with peroxide and  chlorine dioxide which is less harmful to the environment.
According to Seventh Generation, "boric acid and pepper sprinkled in places like backs of cupboards" are effective methods of pest control  as a substitute for harmful insecticides and poisons. As well "planting  mint around the house" will help discourage pests from entering your  home. Cedar chips are effective for moth control, and even feeding your  dog brewers yeast will help control fleas.
Appliances-
It  is very important to keep up on the maintenance of your refrigerator  and air conditioners as they can leak very toxic and harmful chemicals.  Furnace maintenance will help to reduce the amount of heat you need,  thus reducing fossil fuel production.
Waste and Recycling-
It is very beneficial to use recycled paper  or to use products that are manufactured from ecologically managed  forests. According to Seventh Generation "if every household in the US  replaced just one roll of 1000 sheets of toilet paper with recycled toilet paper,  could save 373,000 trees, 1.48 million cubic feet of landfill space  (equal to over 1682 full garbage trucks), 155 million gallons of water  (a years supply for 4465 families of four) and avoid 62,000 pounds of  pollution". It has been said that it takes roughly 19 trees to make one  ton of paper and that the usage of one ton of recycled paper will save  approximately 17 trees. Of course there is the importance of recycling  your trash, separating the cans, glasses and papers.
Home maintenance-
Due  to the harmful process of making fossil fuels, we should do what we can  to reduce their production. Weatherstripping, insulation and proper  ventilation will go along way to reducing the amount of heat your home  needs. Use of cold water instead of hot will reduce the amount of energy  needed, as well only running dishwashers and washing machines when full.
Composting  will help you to dispose of biodegradable waste in your home and  planting trees on your property will enhance the appearance of your  home. As well as being visually appealing, trees help to control carbon  dioxides in the air, and helps to dispose of toxins in the soil. Thus  preventing them from being released into the atmosphere.
Arguments  are being debated over how extensive this problem is and according to  Albert K Bates who wrote "Climate in Crisis", "the current warming is  happening much faster than it has ever happened looking back millions of  years". He also continues on to say, "it now seems evident that this  most recent warming is caused by human activity, rather than by  geological or astronomical processes" If it is by human practices that  we have caused this issue, then it should be by human intervention that  it is impeded or reversed. 
We  can STOP global warming and end climate change now and still keep our  high standard of living. So Let us all come together to save our Mother  Nature, earth and future of our next generations.
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