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Thursday, March 13, 2008


what i think about climate change

i think that climate change is somehing that cannot be controlled.which means it happens naturally.in the recent years,climate had changed so quickly that it is causing natural disasters like flooding, hurricanes and tornados.we must do somethig to slow down this process or earth will be in a great mess!!climate change is also known as global warming. so as uall know that global warming is one of the world most freqent topics now.so most of the countries are trying their best to do the three "r"s. but there is still rich coutrieslike UK and australia who are refusing o do their part.so for those who are reading this post now, and if youhave not started doing their part for global warming, start now !!!



+byebye+;
12:36 AM


Wednesday, March 12, 2008


climate change: whose problem is it?

What is climate change?
Climate change is any long-term significant change in the “average weather” that a given region experiences. Average weather may include average temperature, precipitation and wind patterns. It involves changes in the variability or average state of the atmosphere over durations ranging from decades to millions of years. These changes can be caused by dynamic process on Earth, external forces including variations in sunlight intensity, and more recently by human activities.
It is mostly caused by human activity like:
Anthropogenic factors are human activities that change the environment and influence climate. In some cases the chain of causality is direct and unambiguous (e.g., by the effects of irrigation on temperature and humidity), while in others it is less clear. Various hypotheses for human-induced climate change have been debated for many years.
The biggest factor of present concern is the increase in CO2 levels due to emissions from fossil fuel combustion, followed by aerosols (particulate matter in the atmosphere), which exert a cooling effect, and cement manufacture. Other factors, including land use, ozone depletion, animal agriculture and deforestation, also affect climate.
Fossil fuels
Carbon dioxide variations over the last 400,000 years, showing a rise since the industrial revolution.
Beginning with the industrial revolution in the 1850s and accelerating ever since, the human consumption of fossil fuels has elevated CO2 levels from a concentration of ~280 ppm to more than 380 ppm today. These increases are projected to reach more than 560 ppm before the end of the 21st century. It is known that carbon dioxide levels are substantially higher now than at any time in the last 750,000 years. Along with rising methane levels, these changes are anticipated to cause an increase of 1.4–5.6 °C between 1990 and 2100 .
Aerosols
Anthropogenic aerosols, particularly sulphate aerosols from fossil fuel combustion, exert a cooling influence. This, together with natural variability, is believed to account for the relative "plateau" in the graph of 20th-century temperatures in the middle of the century.
What will happen to earth if this goes on?
In their recent research, they generated daily weather patterns that match historical records and predicted climates with double the carbon dioxide using a General Circulation Model (GCM) of the atmosphere. The daily weather that resulted was entered into a soil-water-vegetation model that represented soil absorbed water, water flow, and storage in soil, surface evaporation, plant uptake, transpiration of water, and deep drainage below the roots of trees and grasses that becomes groundwater recharge.
The simulation models showed that changes in the temperatures and rainfall affected growth rates and leaf size of plants which impacts groundwater recharge. In some areas, the vegetation response to climate change would cause the average recharge to decrease, but in other areas, recharge to underground water would more than double.




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10:37 PM









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9:44 PM


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