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ग्‍लोबल वार्मि‍गं Tag

16 Dec

Posted at 07:11h in Miscellaneous
डॉ रामावतार यादव एवं डॉ वीर सिंह सहायक 9 views

Global warming is a growing threat to the environment पूरे विश्व में इंसानों की लापरवाही और निजी स्वार्थ से हमारी धरती की सतह दिनों-दिन गर्म होती जा रही है। पिछले 50 वर्षों में, औसत वैश्विक तापमान रिकॉर्ड इतिहास में सबसे तेज दर से बढ़ गया है और वैज्ञानिकों का कहना है कि अगर ग्लोबल वार्मिंग उत्सर्जन को नहीं रोका गया, तो अगली शताब्दी तक औसत तापमान 10 डिग्री फ़ारेनहाइट तक बढ़ सकता है। ग्लोबल वार्मिंग के क्या कारण है? ग्लोबल वार्मिंग के कारण होने वाले जलवायु परिवर्तन के लिये सबसे अधिक जिम्मेदार ग्रीन हाउस गैस हैं। ग्रीन हाउस गैसें, वे गैसें होती हैं जो बाहर से मिल रही गर्मी या ऊष्मा को अपने अंदर सोख लेती हैं। ग्रीन हाउस गैसों का इस्तेमाल सामान्यतः अत्यधिक सर्द इलाकों में उन पौधों को गर्म रखने के लिये किया जाता है जो अत्यधिक सर्द मौसम में खराब हो जाते हैं। यह गैस सूरज से आने वाली किरणों की गर्मी सोख लेती है और पौधों को गर्म रखती है। ठीक यही प्रक्रिया पृथ्वी के साथ होती है। सूरज से आने वाली किरणों की गर्मी की कुछ मात्रा को पृथ्वी द्वारा सोख लिया जाता है। इस प्रक्रिया में हमारे पर्यावरण में फैली ग्रीन हाउस गैसों का महत्त्वपूर्ण योगदान है। अगर इन गैसों का अस्तित्व हमारे में न होता तो...

13 Jun

Posted at 10:04h in Miscellaneous
7 views

भारतीय कृषि पर जलवायु परिवर्तन के प्रभाव का आकलन Climate change and variability are concerns of human being. There current droughts and floods threaten seriously the livelihood of billions of people who depend on land for most of their needs. The global economy is adversely being influenced very frequently due to extreme events such as droughts and floods, cold and heat waves, forest fires, landslips etc. The natural calamities like earthquakes, tsunamis and volcanic eruptions, though not related to weather disasters, may change chemical composition of the atmosphere. It will, in turn, lead to weather related disasters. The loss of forest cover, which normally intercepts rainfall and allows it to be absorbed by the soil, causes precipitation to reach across the land eroding top soil and causes floods and droughts. Paradoxically, lack of trees also exacerbates drought in dry years by making the soil dry more quickly. Among the greenhouse gases, CO2 is the predominant gas leading to global warming as it traps long wave radiation and emits it back to the earth surface. Climate change and agriculture Based on some of the past experiences indicated above, impact of climate change on agriculture will be one of the major deciding factors influencing the future food security of mankind on the earth. Agriculture is not only sensitive...

14 Sep

Posted at 08:30h in Miscellaneous
Sainath Nagula 11 views

ग्रीनहाउस गैस उत्पादन पर मानवकृत गतिविधियों और कृषि कार्यो का प्रभाव Human activities contribute to climate change by causing changes in Earth’s atmosphere in the amounts of greenhouse gas­es, aerosols (small particles), and cloudiness. Human activities like burning of fossil fuels (coal, oil and natural gas), deforestation and various agricultural and industrial practices, are altering the composition of the atmosphere and contributing to climate change.  These human activities have led to increased atmospheric concentrations of a number of greenhouse gases (GHGs), including carbon dioxide, methane, nitrous oxide, chlorofluorocarbons, and ozone in the lower part of the atmosphere. The largest known contribution comes from the burning of fossil fuels, which releases carbon dioxide gas to the atmosphere. GHGs affect climate by altering incoming solar radiation and out-going infrared (thermal) radiation that are part of Earth’s energy balance. Changing the atmospheric abundance or properties of these gases and particles can lead to a warming or cooling of the climate system. Since the start of the industrial era (about 1750), the overall effect of human activities on climate has been a warm­ing influence. The human impact on climate during this era greatly exceeds that due to known changes in natural processes, such as solar changes and volcanic eruptions. Human activities result in emissions of four principal green­house gases: carbon dioxide...

14 Sep

Posted at 08:02h in Miscellaneous
Sainath Nagula 13 views

कार्बन ट्रेडिंग पर अंतर्राष्ट्रीय सम्मेलन और वैश्विक पहल Carbon is the common denominator in all polluting gases that cause global warming. Carbon dioxide is the gas most commonly thought of as a greenhouse gas. It is responsible for about half of the atmospheric heat retained by trace gasses. It is produced primarily by burning of fossils fuels and deforestation accompanied by burning and bio-degradation of biomass.  It is estimated that if the CO2 increases in the atmosphere at the present rate and no positive efforts are pursued, the level of CO2 in the atmosphere would go up to 800-1000 ppm by the end of current century. Which may create havoc for all living creatures on earth. The Intergovernmental Panel on Climate Change (IPCC) have predicted that unless emissions of greenhouse gases decrease there will be a temperature increase of between 1.4oC and 5.8oC by 2100. Carbon trading The idea behind carbon trading is quite similar to the trading of securities or commodities in a marketplace. Carbon would be given an economic value, allowing people, companies or nations to trade it. If a nation bought carbon, it would be buying the rights to burn it, and a nation selling carbon would be giving up its rights to burn it.  A market would be created to facilitate the buying...