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A brief exposure to extremely high sound level, 150 dB or more generated by take off of a jet plane or rocket, may damage ear drums thus permanently impairing hearing ability. Even chronic exposure to a relatively lower noise level of cities may permanently damage hearing abilities of humans.
Climate Change & Its Causes. It is the range of global phenomena caused by burning fossil fuels that add heat-trapping gases to the Earth’s atmosphere. Global warming, used interchangeably with climate change, specifically refers to Earth’s upward trends of temperature since 20th century.
Everyday we hear sounds from various sources like humans, birds, bells, machines, vehicles, televisions, radios etc. Sound is a form of energy which produces a sensation of hearing in our ears. There are also other forms of energy like mechanical energy, heat energy, light energy etc. We have talked about mechanical energy in the previous chapters.
Global warming is a gradual increase in the average temperature of the earth’s lower atmosphere as a result of the increase in greenhouse gases since the Industrial Revolution.
5 ημέρες πριν · Modern global warming is the result of an increase in magnitude of the so-called greenhouse effect, a warming of Earth’s surface and lower atmosphere caused by the presence of water vapour, carbon dioxide, methane, nitrous oxides, and other greenhouse gases.
Environmental Issues Class 12 Notes: Here, you will get Environmental Issues Revision Notes for Class 12 PDF Format for Free of Cost. You can also download CBSE Class 12 Environmental Issues Handwritten and Short Notes to get higher marks.
It will discuss the basics of climate science and the phenomenon of climate change, before elaborating on two key concepts relevant for climate change responses: mitigation and adaptation. This material will be used to better understand how these concepts are applied in an urban context.
