AE4-Global Climate Change

  1. Greenhouse gases absorb the energy emitted by the Earth’s surface, thus resulting in enhanced greenhouse effect. Since the net energy leaving the Earth’s surface is lesser than the solar energy striking Earth’s surface, therefore the earth is not cooling rapidly.
  2. The picture depicts snowing, which is the opposite of what the two men thought of global warming because the word “warming” tends to make people think that the world is getting hotter. However, the fact is that global warming is a gradual phenomenon – some regions experience extreme climate/temperature change while others might not experience such significant change. And one of the consequences of global warming is extreme climate change, which can be shown in the picture that the snow has accumulated up to their chest level.
  3. The first radar device invented had a purpose to locate distant objects by bending radio waves off them and analyse reflection. It did not have an internal magnetron tube. The magnetron tube emits electromagnetic (EM) waves around the frequency of 2.45GHz. The water molecules are electric dipoles, which will rotate themselves rapidly when trying to align themselves with the alternating electric fields from the microwaves. Since the magnetron tube was absent in the radar device, there were no EM waves emitted and water molecules were not rotated.
  4. In the short run, we believe that air quality poses the most serious problems. For example, seasonal haze could cause acute health effects such as asthma and other respiratory illnesses. In the long run, global warming poses the most serious problems because damages caused by global warming might be irreversible such as melting of glaciers, rising sea levels, and sinking of lands. These effects cannot really be seen immediately. We did not choose stratospheric ozone depletion because ozone production is regenerative and its repercussion is not that huge.

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