Has human activity caused the worlds climate to change over the past 100 yrs?
Yes or no opinions on the matter and reasons why please and thank you! :)
(climate change meaning global warming)
- 9 years agoFavorite Answer
Yes, human activity has had, and continues to have an effect on the world's climate.
The thing to remember is that so does everything else on this planet, from volcanoes to wild fires to ruminant animals like cattle, yaks, and llamas to microscopic algae in the oceans. All living things are connected to the Earth and therefore what we do affects everything on the Earth including the Earth itself.
The planet has been in a constant state of change ever since it formed about 4 and half billion years ago. What has allowed us as humans to evolve to the point to where we have such a great influence on our environment is the very fact that climate has been changing for a long long time. Climate change forced us to evolve into the species of adaptability. This adaptability has enabled us to basically rule the planet (though not always in the smartest way).
Climate change is not a bad thing. We just need to be aware of it and respect it -- the way people that live next to the ocean respect the ocean or people that live next to a volcano respect it's presence. We need to understand it and plan for its inevitable change rather than control it. Trying to control the oceans or earthquakes or volcanoes or hurricanes would be silly, yet much easier than trying to control the inertia of the change in climate.
- Anonymous9 years ago
Although there is little doubt that the Earth's climate has become warmer over the twentieth century, there is still an ongoing debate about whether the temperature increase is due to natural variations or to human activity. Two groups of UK scientists have recently investigated both types of effect. Mike Lockwood and colleagues at the Rutherford Appleton Laboratory (RAL) argue that the Sun's magnetic field has doubled over the century, and that this natural "solar forcing" will have affected the earth's climate (Nature 399 437). Meanwhile Simon Tett and colleagues from the UK's Meteorological Office in Reading and RAL argue that while solar forcing may have contributed to climate change early in the century, humanity activities have been responsible for the temperature changes over the past 50 years (Nature 399 569).
The Earth's average global temperature has increased by 0.6 Kelvin in the past 100 years. There are believed to be four main processes that can effect the Earth's climate. Two of these, small aerosol particles from volcanic eruptions and changes in solar luminosity, occur naturally. The other two, sulphate aerosols and greenhouse gases such as carbon dioxide, are due to increasing industrialization, in particular the burning of forests and fossil fuels.
Lockwood and colleagues found that the total magnetic flux leaving the Sun has risen by a factor of 1.4 since 1964, and has probably increased by a factor of 2.3 since 1901. Their results could provide support for the theory that changes in the solar wind - a stream of charged particles emitted by the Sun - could contribute to climate change. The solar wind and the Sun's magnetic field are intimately linked. According to the theory charged particles in the solar wind would deflect high-energy cosmic rays that would otherwise have ionized the Earth's lower atmosphere, leading to the formation of clouds. Since cloud cover determines the amount of solar radiation reflected by the Earth back into space, a more powerful solar wind implies less cloud cover which, in turn, suggests that the Earth would warm up.
However, the paper by Tett and colleagues suggests that natural effects alone cannot account for the pattern of temperature change observed over the past 50 years. They used the HadCM2 computer model to predict the Earth's global temperature during five overlapping 50-year periods (1906-56, 1916-1966, .), and then compared the results with observations. The program models both the oceans and the atmosphere, and also allows for changes in greenhouse emissions, surface albedo (i.e. reflectivity), volcanic aerosols and solar irradiance. They ran the programme with a number of different solar models, including one that matched the effects highlighted by Lockwood. The results were similar for all cases: it is not possible to distinguish between the contributions of human activity and natural variations to global warming in the first half of the century, but after 1946 increases in the concentration of man-made greenhouse gases and sulphate aerosols was the dominant effect.
- Anonymous9 years ago
A large body of scientists published a large and semi-annual study called the Intergovernmental Panel on Climate Change. This publication links the deviation of "usual amounts" of greenhouse gases in the earths atmosphere to human behavior.
This is so because over the last several decades the human population has not only doubled but more people who were not living industrialized lives, now are. What that means is not everyone (in say China) had the ability or was interested in: driving cars, having a urbanized lifestyle, new technology mediums (tv's, computers, etc...), consuming certain kinds of food (like beef - which is resource intensive to raise and process) - all these things are increasing rapidly to accommodate the growing population and developing nations. All of these activities require more energy than was previously being used. To create more energy, humans use abundant forms of energy - like: coal, oil, and natural gas. As humans use more of these resources to make energy - the amount of carbon produced also increases.
- GayLv 44 years ago
Yes, the world changed a lot in fact. If we looked back, the earth in the past had ways that balanced itself making it the perfect world for living things. But now humans altered a lot of things to make it more efficient for us, but in the process destroying the balance in nature. For example, we build roads and homes which destroys animals' habitats. We pollute nature with trash that cannot naturally decompose which produces problems on Earth. Not to mention the carbon dioxide build up in the atmosphere destroying the ozone layer which causes the global warming.
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- Mr.357Lv 79 years ago
The climate has been changing since the Earth was formed. It is really hard to determine whether climate change is naturally occuring that this time or if it is caused by man. Since the climate has not changed more than can naturally be expected, I would say than man has no or very minimal impact on climate.
- BiPetualLv 79 years ago
Yes, absolutely. We have been putting millions of tons of carbon into the air for two hundred years, and almost all of the CLIMATE SCIENTISTS (not the meteorologists - they can't predict next week's weather, so of course they figure climate science is impossible. But it's not their area of expertise.) agree that the earth is getting warmer.
During the 2003 heatwave that killed over 30,000 people in Europe, scientists analyzed the type of carbon in the air, along with oxygen isotopes, and were able to determine that the burning of fossil fuels by humans was responsible for 50% of the carbon that caused the heat wave.
We're not talking about one guy, or one town, burning a little coal in the winter. We're talking about the entire developed world burning coal and oil as fast as they could get their hands on it. For a hundred years. It adds up!
- 9 years ago
Its a definite yes.
We humans are responsible for the drastic changes thats happening now. The planet has always been changing but not as drastic as it is happening now.
Ever since the industrial revolution began there has been an considerable increase in the percentage of the green house gases in the atmosphere.Hence the change we are going through now.Scientist do predict if this carries on there may be an increase in temp in the range of 2-6 degrees which is too much to handle. Most of the beings could face extinction because of the consequences.
There have been numerous life forms in this planet before us and i guess none of them have even came close to scale of damage we r doing to our planet now.We have been fortunate in many ways with the technological advancements and all those.
Unless we start to think about our mother nature and act accordingly we may become the most unfortunate being to have initiated the dooms day and left nothing to our future generations...
Either we do it ourselves or mother nature has its ways to balance the whole planet and it could be cruel.....
So lets all start to do wat we can do stop this mess we created...
- Elmer98Lv 79 years ago
yes. Climate reacts to whatever forces it to change at the time; humans are now the dominant forcing