Impact of Pollutions on Environment and Its Hazards of Ecosystem & Ecography

Global warming is caused by rising levels of carbon dioxide in the atmosphere that acts as blanket to contain radiated heat and raises overall global temperatures to dangerous levels leading to melting glaciers rising sea levels. Most OECD countries and countries with economies in transition, agreed to control their national anthropogenic emissions and greenhouse gases (CO 2 , CH 4 , N 2 O, HFCS, PFCS and SF6). Environment is complex of so many things (light, temperature, soil, water. Any outer substance or condition which affects living being in any form is factor of its environment. Climate of any region determined by meteorological influences, temperature, wind pressure, etc.


Introduction
Changes in either mean or variability of climate will have an impact on crop growing conditions, affecting agricultural productivity and the suitability of crops in different agroecological zones (if not the nature of the agroecological zones themselves), potentially creating challenges and opportunities in both socioeconomic and food security terms.
High temperatures can lead to negative impacts such as added heat stress and increased water demand, especially in low-and mid-latitude areas already at risk [1].
Climate change may trigger the proliferation of weeds, pests, and diseases, which have the potential to severely limit crop production.
Changes in precipitation can result in a reduction of water availability for rain fed crops, and alterations of discharge in river systems may lower the reliability of irrigation water supply for irrigated crops.
An increased frequency and intensity of droughts can disrupt agriculture production and may also increase salinity in soils and water, increasing the possibility of irreversible desertification.
(Alkaline/saline soil) Sea level rise can increase salinity in water and land in coastal areas, severely disrupting agricultural production [2].
Areal factors effecting environment of organism include light, temperature, humidity rainfall. Light intensity reaching the earth surface shows much spatial variations being influenced by: • Nitrogen, oxygen, atmospheric gases • Suspended particles, solid particles dispersed in air • Water layers • Layers of vegetation terrestrial habitats on forest • Topographic factors as direction and slope

Radiant energy
Energy of sun reaching the earth transformed into thermal mechanical and electrical. The great deal of solar energy absorbed in the atmosphere.
All metabolic process of plants and animals are influenced by temperature. Since temperature regulates the activity of enzymes all chemical reactions are controlled by temperature. It affects the rate of transpiration photosynthesis in plants and respiration rates. Low temperature leads to chilling injury and freezing injury (Table 1).

Pollutants Medium
Ozone , DDT Air

Rainfall
The water available to plants and animal from soil comes from water reservoir. There occurs an interchange of water between the earth surface and the atmosphere forming the water or hydrologic cycle. Two important events are precipitation and evaporation.
Humidity: It is expressed in terms of relative humidity values. It is the amount of moisture in air as percentage of the amount which air hold at saturation at existing temperature.
Wind factor: It is important ecological factor as it affects plants, along seacoast and at high altitude in mountains. Wind is directly involved in transpiration and cause mechanical damage.
Kinds of pollutants: Air pollution may be recognized on the basis of environment, water pollution, soil pollution, marine pollution etc. Other kinds of pollutants involved are Sulphur dioxide pollution, fluoride pollution, carbon monoxide pollution, radioactive and noise pollution.
Two basic types of pollutants we recognize are non-degradable and biodegradable. Non degradable are poisonous substance like aluminium cans, mercuric salts, long chain phenolics, DDT. Biodegradable pollutants are agricultural waste and domestic waste that can be decomposed under natural conditions.

Measurement of Air Quality
The central pollution control board (CPCB) has formulated an air quality standard for different sectors of country. For SO 2 Kolkata is most polluted city followed by Delhi, Mumbai, Ahmedabad Kanpur, Hyderabad Chennai, Nagpur and Jaipur. NO X levels ranged from 4 µg/m 3 to highest 40 µg/m 3 . SPM was the highest in Delhi and Kolkata and the lowest in Chennai and Mumbai. The SPM levels in all cities were much above the international levels.

Industrial chimney waste
The chief gases are SO 2 and NO x . Mathura based petroleum refinery is posing threat to Taj Mahal in Agra and other monuments in Fatehpur Sikri. The consequences of relentlessly increasing road traffic are adverse effects on human health and both the local and global environment (Figure 1).
Automobile: All motor vehichle transport produces Carbon Dioxide (CO 2 ) one of the so called "greenhouse gases" that contribute to climate change. Trains are an energy-efficient carrier of people and goods and produce relatively less CO 2 emissions. Use of train, cycle and animals reduce emission of greenhouse gases.
India has different agro-climatic regions desert, tropical and high rain fall. Few tropical states have low adaptation to climatic changes. We studied Maharashtra region for climatic changes and as this state had drought situation in past, this state is model for the study of climatic changes [4].

Rainfall and Weather
The weather of the district is generally hot and dry. Ahmednagar district is known as drought stricken region of the Maharashtra. In 2008-09 the average rainfall of the district was 524 mm. According to statistics, it can be said that the proportion of rainfall was low during the two years of 2007-2009.  Bajra is important crop of the District. However other crops like wheat, paddy and other cereals are also grown in various parts of the District. Paddy is mainly grown in Tribal belt i.e., Igatpuri, Peth, and Surgana Blocks. Vegetables and Onion were main cash crops for last 30 years. Because of variety of vegetables and its supply to Mumbai, the District was known as Backyard of Mumbai. After establishment of sugar factories, Sugarcane has acquired important position in the agriculture economy of the District. One sugar factory under private sector at Ravalgaon and other sugar factories under co-operative sector at Niphad, Ranwad, Palse, Materewadi and Vithewadi are functioning in the District. Economic development in the rural area with speed started only after establishment of sugar factories. The Government has granted permission for starting four sugar factories under private sector as a result of the liberalisation. One sugar factory in private sector has started functioning in Satana Block (Dwarkadhish). This development was however concentrated around the existing sugar factories. Since last 20 years the grape has acquired dominance on the agricultural economy of District. Due to water shortage in Kalwan, Deola, Baglan and Malegaon blocks the farmers have shifted to Pomegranate from sugar cane and grape crops. Some progressive farmers are cultivating flowers in green houses. These developments also indicate that the farmers in the District adopt new technology and methods of cultivation very fast.

Conclusion
Global warming and climate change effects can be controlled by reducing greenhouse gas emissions and anthropogenic activities. Also climate change has impacts on agricultural productivity. Selection of crop in drought condition is very important for good agronomic yield. Environmental awareness in society play important role in climate change. Plantation of fast growing trees may help in ecological balance. Human luxury is also cause of increased harmful gases.