HAND TOOLS USED AT ELECTRONICS WORK PRESENTED BY KOUSTAV SARKAR
11.ppt
1. 24-01-2023 1
The Primary Source of Energy: Sun
Tree Wood Coal Oil
Coals, oils are ancient fossilized solar energy stored for 100 million years
isotalks # 10
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•Carbon dioxide or CO2
•Methane or CH4
•Nitrous oxide or N2O
•Perfluorocarbons or PFC compounds
•Hydrofluorocarbons or HFC compounds
•Sulphur hexafluoride or SF6
•Ozone or O3
•Bromine compounds or halogens, e.g. CF3Br
•Freons or chlorofluorocarbons or CFC:s
•Water vapour or H2O (g)
• CO2 makes up approximately 85 percent of total greenhouse gas (GHG)
emissions.
In the last century, human activities like burning fossil fuel and
deforestation have caused a jump in the concentration of
greenhouse gases in the atmosphere resulting extra trapped heat
and higher global temperature (global warming)
Source: IPCC Fourth Assessment Report
Greenhouse gases & greenhouse effect
isotalks # 10
From the beginning of human civilization, sun is the primary source of energy. We take almost all our energy from the Sun. The Sun sends the energy that trees absorb and store. For many years of human civilization, we used firewood as our primary source of energy. Then we discovered coal, using coal, we started the industrial revolution. Then we discovered oil and natural gas. Whether it’s coal, oil. it’s all ancient fossilized solar energy, stored for 100 million years.
As civilization progresses, the demand for global energy consumption rises with increasing population and economic development of residential, commercial, industrial areas as well as transportation. With this rising global energy consumption, Global atmospheric concentrations of greenhouse gases have increased markedly as a result of human activities!
The family of greenhouse gases (GHGs) comprise of… .The Earth has a natural temperature control system. Certain atmospheric gases are critical to this system.. On average, about one third of the solar radiation that hits the earth is reflected back to space. The Earth's surface becomes warm and as a result emits infrared radiation. The greenhouse gases trap the infrared radiation, thus warming the atmosphere. Naturally occurring greenhouse gases create a natural greenhouse effect. However, In the last century, human activities like burning fossil fuel and deforestation have caused a jump in the concentration of greenhouse gases in the atmosphere resulting extra trapped heat and higher global temperature (global warming).
