The surface of the earth has been warming, the average temperature increasing, for several years. People studying this do not agree on the cause of the warming trend. Some say that man has caused the change; others claim that it is a natural trend. If some environmentalists are to be believed, we are on the verge of massive global climate change which will see a significant rise in sea levels, chaotic weather patterns, and catastrophic droughts all caused by small increase in global average temperature. Whether global warming is a problem that can be dealt with, will depend not only on the ways that are available to governments and people to act but also on their will to act in response to this environmental change.
We chose this topic “CLIMATE CHANGE” because now this days our climate is not stable. We should know the stage of our climate. What are the basic causes of climate change? What is the difference between weather and climate?How is the climate changing? What is global warming and what are scientists’ predictions for the planet in our lifetimes and beyond? Where will the impact be greatest? How doeswater play a role in heating and cooling our climate? What is the greenhouse effect and what are fossil fuels? How fast have greenhouse gas emissions grown in recent decades? And what forces actually cool the atmosphere? This section on Climate 101 provides a quick overview of the factors causing temperatures to rise and the climate to change.
DEFINETION OF CLIMATE CHANGE
Internal forcing mechanisms
Magnetic field strength
Temperature measurements and proxies
Historical and archaeological evidence
Arctic sea ice loss
Sea level change
For current and future climatological effects of human influences, see global warming. For the study of past climate change, see paleoclimatology. For temperatures on the longest time scales, see geologic temperature record.
Climate change is a significant and lasting change in the statistical distribution of weather patterns over periods ranging from decades to millions of years. It may be a change in average weather conditions, or in the distribution of weather around the average conditions (i.e., more or fewer extreme weather events). Climate change is caused by factors such as biotic processes, variations in solar radiation received by Earth, plate tectonics, and volcanic eruptions. Certain human activities have also been identified as significant causes of recent climate change, often referred to as "global warming" Scientists actively work to understand past and future climate by using observations and theoretical models. A climate record — extending deep into the Earth's past — has been assembled, and continues to be built up, based on geological evidence from borehole temperature profiles, cores removed from deep accumulations of ice, floral and faunal records, glacial and periglacial processes, stable-isotope and other analyses of sediment layers, and records of past sea levels. More recent data are provided by the instrumental record. General circulation models, based on the physical sciences, are often used in theoretical approaches to match past climate data, make future projections, and link causes and effects in climate change. Terminology
The most general definition of climate change is a change in the statistical properties of the climate system when considered over long periods of time, regardless of cause.Accordingly, fluctuations over periods shorter than a few decades, such as El Niño, do not represent climate change. The term sometimes is used to refer specifically to...
References: IPCC AR4 WG1 (2007). Solomon, S.; Qin, D.; Manning, M.; Chen, Z.; Marquis, M.; Averyt, K.B.; Tignor, M.; and Miller, H.L., ed. Climate Change 2007: The Physical Science Basis. Contribution of Working Group I to the Fourth Assessment Report of the Intergovernmental Panel on Climate Change. Cambridge University Press. ISBN 978-0-521-88009-1 (pb: 978-0-521-70596-7).
IPCC AR4 SYR (2007). Core Writing Team; Pachauri, R.K; and Reisinger, A., ed. Climate Change 2007: Synthesis Report. Contribution of Working Groups I, II and III to the Fourth Assessment Report of the Intergovernmental Panel on Climate Change. IPCC. ISBN 92-9169-122-4.
IPCC TAR WG1 (2001). Houghton, J.T.; Ding, Y.; Griggs, D.J.; Noguer, M.; van der Linden, P.J.; Dai, X.; Maskell, K.; and Johnson, C.A., ed. Climate Change 2001: The Scientific Basis. Contribution of Working Group I to the Third Assessment Report of the Intergovernmental Panel on Climate Change. Cambridge University Press. ISBN 0-521-80767-0 (pb: 0-521-01495-6).
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