Has human activity caused the world's climate to change over the past 100 yrs.? If 'YES', why?

Question

=> This is for a science-project for Global Warming.
=>This is part 1-of-3.

Answer 1

Yes. Global warming is actually a part of the planet's natural cycle. This is why there is periods of ice age and periods of warming.

One of the causes of the human activity is that we have accelerated the cycle up by a lot. So the things are happening a lot faster.

Answer 2

Nobody knows for sure; there is widespread opinion that it is true, but there is no conclusive evidence, and cannot be: no way to conduct a controlled experiment. (All the evidence we have comes from computer simulations.) We know for sure that the atmospheric level of CO2 has increased over that time, although it is still only about a quarter of what it was when the dinosaurs flourished. (CO2 has strong absorption of infrared, so tends to retard the radiation of heat from the earth.) We are reasonably sure that the temperature has increased based on glacial retreat, but the temperature has been changing throughout earth's history without help or hindrance from mankind (consider the ice ages). One thing we can know for sure: if humanity attempts to do anything serious about CO2 levels, it will be almost unbelievably expensive; the UN has proposed a program with a price tag of $557,000,000,000,000 -- far more than the total value of every asset on the planet.

Answer 3

a great physique of scientists revealed a great and semi-annual learn called the Intergovernmental Panel on climate replace. This e book hyperlinks the deviation of "commonplace quantities" of greenhouse gases in the earths environment to human habit. it extremely is so because of the fact over the final various many years the human inhabitants has no longer in basic terms doubled yet extra people who weren't living industrialized lives, now are. What meaning isn't each and every person (in say China) had the skill or replaced into interested in: driving automobiles, having a urbanized existence type, new technologies mediums (television's, computers, and so on...), eating particular kinds of nutrition (like beef - that's source in intensity to develop and technique) - those sort of issues are increasing at as quickly as to handle the transforming into inhabitants and coming up countries. All of those activities require extra capability than replaced into before getting used. To create extra capability, people use substantial varieties of capability - like: coal, oil, and organic gasoline. As people use extra of those supplies to make capability - the quantity of carbon produced additionally will strengthen.

Answer 4

yes, humans has something to do with global warming. The main cause of this if the destruction of the ozone layer (CFC's effect which can be found in styro, refrigerator, aircon, sprays especially hair spray...)

Heat radiation as we all know came from the natural source which is the sun. then it will travel to earth's surface, and it will give us enough heat to warm ourselves. Because radiation bounces (similar to the light..cannot think of the better word) it will go back to the universe with the help of ozone layer. But since we now have a damaged ozone layer heat radiaton was trapped inside the earth and could not penetrate because of the damage we have caused to that atmospheric layer.

Example of this global warming is the Antartica, actually the ice are now breaking because of earth's too much heat and there came the other effect which is the endangered polar bears. If you can watch the documentary of Al Gore "Unconventinal Truth" it will help you a lot to answer your question. There he showed photographs of mountains that used to be covered with ice but due of global warming it came to be an ordinary mountain. Pathways that used to be covered with ice are now part of bodies of water. But the most terrifying example he had shown was the possibility to wipe out a city in U.S. because of the rise of water (which is caused of breaking ice) Photographs also include a trip to the Patagonian ice fields to wander in melting ice caves, a visit to Glacier National Park, which is losing its glaciers, an examination of the capability of the rain forests to withstand drought, evidence of flooding on islands in the Pacific, and evidence that the coral is dying on the Barrier Reef in Australia.

The debate about global warming is focused on the issue of cycles: whether the warming can be explained as part of a natural cycle. The documentary's experts insist that it cannot and that the problem is now too obvious to ignore. A visit to China shows that the amount of carbon dioxide will continue to increase rapidly because Asian nations such as China and India are rapidly bringing their countries up to Western industrial standards.

The primary message of the documentary is that many things can be done to slow global warming and soften its coming impact, including changes in behavior of ordinary people in industrialized nations. It is also noted that it would be helpful for the United States to return to its previous role of leadership in the matter.

He also supported his documentary by showing graphs of earth's heat from 1950's (im not sure with that year all i know it is far from 1990's) up to 2005. Well, as it shows you would evidently see that we are in a super hot earth. 2005's graph is very far from 2003..And it is getting worse...

If only humans can think of the consequences first before putting it out to the market, most probably we have lessen the global warming. I am afraid of what might happen to next 100 years..I forgot the title of the movie wherein there were no more land but water all around the world..there is a possibility that this could happen...

Answer 5

yes, to a certain extent. excessive use of fossil fuels, cutting down of trees have released CO2 n other greenhouse gases in2 the atmosphere.this has happnd to meet the demands of the ever-growing papulation. as a result, they have enveloped the earth n do not allow sun rays to reflect back. hence the earth has heated up. why dont u browse wikipedia or encarta a bit ?