Scientific experts agrees that global climate change is accelerating. Human activities are responsible for the vast majority of climate change. If it is left unchecked, climate change threatens to harm current and future generations. The emission of heat trapping gases by vehicles, industrial processes, power plants and deforestations cause climate change. Rising temperature and changing patterns of precipitation drastically shift vegetation. We forget that this vegetation plays an important role in changing the climate of a city. It is also effective in controlling the microclimate. Plants, shrubs and trees cool the environment when they absorb radiation for photosynthesis. They are useful in shading a particular part of the structure and ground for reducing the heat gain and reflected radiation. By releasing moisture, they help raise the humidity level. Vegetation also creates different air flow patterns by causing minor pressure differences, and thus can be used to direct or divert the prevailing wing advantages.
Based on the requirement of a climate, appropriate type of trees can be selected to preserve good climate of cities. Planning deciduous trees such as mulberry to shade east and west walls would prove beneficial in hot and dry zones. In summer, they provide shade from intense morning and evening sun, reduce glare, as well as cut off hot breezes. On the other hand, deciduous trees shed their leaves in winter and allow solar radiation to heat the building. The cooling effect of vegetation in hot and dry climates comes predominantly from evaporation, while in hot humid climates the shading effect is more significant.
Trees can be used as windbreaks to protect both buildings and outer areas such as lawns and patios from both hot and cold winds. The velocity reduction behind the windbreak depends on their height, density, cross-sectional shape, width, and length, the first two being the most important factors. When the wind does not blow perpendicular to the windbreak, the sheltered area is decreased. The rate of infiltration in buildings is proportional to the wind speed reduction in extreme climates, than to attempt to maximize the distance over which the windbreak is effective.
In cold climates, windbreak can reduce the heat loss in buildings by reducing wind flow over the buildings, thereby reducing convection and infiltration losses. A single-row of high density trees in the form of a windbreak can reduce infiltration in a residence by about 60% when planted about four tree heights from the building. This corresponds to about 15% reduction in energy costs.
Thus, trees can be effectively used to control the microclimate.
The Hindu - Opinion
TAGS for articles
AGRICULTURE Andamans ANDHRA PRADESH Articles in Yojana Magazine BANKING Bio-Diversity Biodiversity CAG 150 Years CAMELS Rating System CENSUS : Important Definitions Census 2011 Census Data 2001 India at a glance Census of India 2011 Champaran Satyagraha's 100 years Children in India 2012 Climate Change Co-operative sector Communication CONSTITUTION Consumer Affairs COP 18 CRPF 75 YEARS Culture Cyclone Defence Desertification Disabled Get Social Justice Doha Climate Change Conference 2012 Outcomes E-Waste Management Eco Mark Economy Education in India eGovernance ELECTRONICS National Policy 2012 Emissions Trading Energy Engineers are Nation Builders Environment FDI FDI in Multi Brand Retail Finance Food Security FOOD SECURITY ACT 2013 Forest Gandhi Gas Authority of India Ltd General Elections 2014 Geography Global knowledge hub Goa Good Governance GOVERNANCE AND PUBLIC SERVICE Governance and Public Service Govt. Schemes Green Bench Handicrafts Haryana Judiciary Health History Home Ministry details and imp websites Horticulture Human Development Rank IARI PUSA IFoS Interview India Post India Year Book 2010 Indira Gandhi Indo Pak Relations Indo USA Indo- Nepal Relations 2014 Industrial Disputes Industry Inflation Infrastructure INTERNAL SECURITY International Relations Internet Interview Preparation Irrigation ISRO : FAQs Jawaharlal Nehru National Urban Renewal Mission Judge Guide JUDICIAL ACTIVISM JUDICIARY Judiciary : Articles on very important topics Kashmir Khadi Language Large Hadron Collider Law LOKAYUKTA ROLE Lokpal and Lokayuktas Bill 2011 Mangroves mate Change Media Mercury MGNREGA: Mahatma Gandhi National Rural Employment Guarantee Act Monetary Policy MSME National Forest Policy (NFP) 1988 National Green Tribunal National Issues National Pension System Nature Naxalism Naxalism : Internal Security Problem in India Naxalism (HINDI) Naxalism LWE Maoism: Problems and solutions Nilgiri North East NRHM- Key Achievements NSS: National Service Scheme Nuclear Science and Nuclear Reactor Nutrition Odiya Film Making 75 Years OUR PARLIAMENT Panchati Raj Parliament of India Peace Process in North East Personality Test Planning Planning Commission of India PM Narendra Modi Speech on 15 Aug 2014 Lal kila Delhi Pollution Population Poverty President election 2017 President's lecture Project Arrow Project Elephant Public Administration Public Administration - Articles/Reports/Papers PURA Qualities of Judge (Judicial Officer) Rabindranath Tagore Railways Rashtriya Swasthya Bima Yojana RBI : Journey into History of Bank of the Bankers Remote Sensing Renewable Energy RTI in brief Rural India SAFAR SARFAESI ACT Science and Technology Sevottam Simla Agreement Social Issues Society Socio Economic and Religious Differentials states Sunderbans Sustainable Development Tamil Tamilnadu Technological Developments Total Sanitation Campaign Tourism Tribes Tripura UPSC Urban Flooding Urban Issues Values Water Issues Water woes Welfare Wildlife Protection and Conservation Women's Issues Zoology