S1E5 -19 Feb Lesson Updates

WHAT'S COVERED TODAY....

Continuation from last lesson...

RECAP.....

WHAT is Global Warming?
Global Warming refers to the rise in Air Temperature because of the Increased emission of Greenhouse gases which is the Enhanced Greenhouse Effect. 

Practice Answering Questions...

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1) What Causes the Increased emission of Greenhouse gases?

Increase in Human activities such as

• Burning of fossil fuels, Burning of forest increases Carbon Dioxide                                                                     (how? > lesser trees available to take in Carbon Dioxide to photosynthesis and therefore it increases CO2)
• Increased raising of livestock > Increased decomposition of Organic Waste, Increased agriculture (water in rice fields) and increased no. of swamps causes an increase in Methane
• Too much of burning of solid waste and excessive use of chemical fertilizer causes an Increase in Nitrous Oxide
• Increase amount of man-made chemicals used in some aerosol sprays, air-conditioners and refrigerators increases the amount of CFCs. This also increases Ozone depletion. 

2) What is the extent of Global Warming all around the Earth?

No. the extent of Global Warming is greater at the north and south poles. At the poles, about 80-90% of Sun's rays are reflected back into space by the ICE (Glaciers). Now with Global Warming and Ozone Depletion, increased melting of ice reduces the amt of Sun's rays being reflected back into space. The increase in melting also results in an increase to the amount of water in the Ocean. Thus the greater the water body (Ocean) the more heat from the Sun will be absorbed....  leading to an Increases in Temperature = Increase in melting of ice at the Poles....  The Cycle repeats. Therefore in the other parts of the Earth, the extent would differ as the presence of the amount of ice is different. 

3) What are the Consequences of Global Warming?

Global Warming causes changes in weather conditions such as Prolonged droughts in dry regions as the increase in temperature causes lesser rain to less evaporation, Frequent heat waves caused by the high temperatures and severer flooding in low lying regions due to the raising sea level with more ice melting / with increased evaporation rate that causes prolonged heavy rain in some regions.                                                  It also has impacts on Plants as the change in rainfall & temperature pattern can affect vegetation growth. Animals are also affected; for example the reduction of polar bears due to the increase in the melting of ice. This reduces it's habitats and causes a reduction of its kind. Humans are affected as the increase in temperature causes problems like more mosquito breeding which leads to diseases like dengue and malaria. Humans can also suffer from dehydration and stroke.