OUR PLANET EARTH IS WARMING

1
OUR PLANET EARTH IS WARMING!

• WHAT ARE THE CAUSES?
• WHAT CAN WE DO ABOUT IT NOW?

2

• Solar radiation strikes the Earth in short
  wavelengths light waves.
• Light waves are absorbed by the Earths surface
  and energy is converted to heat.
• About 30 of incoming solar energy absorbed is
  reflected back to space.

3

• The surface of the Earth absorbs energy from
  solar radiation in short wavelengths and
  reradiates part of it at longer wavelengths.

4

• Albedo is the percentage of solar radiation
  reflected (reflexivity) by matter
• fresh snow reflects 85-95 of solar radiation
• Dry sand reflects 35-40
• Forest reflects about 13
• Earths albedo is about 30

5

• Atmospheric gases called greenhouse gases absorb
  and reemit much of this long wavelengths
  radiation back to Earth.
• About half of the total solar energy absorbed at
  the surface evaporates water adding to the
  greenhouse gases.

6

• Human activities also generate greenhouse gases
  that add to the naturally processed ones and
  contribute to greater long wavelengths radiation
  warming the Earths surface.

7
We Can reduce Global Warming!

• Continuous Global Warming can finally lead to the
  end of all forms of life on Earth.
• We can reduce the impact of Global Warming by
  reducing the levels of emissions of greenhouse
  gases caused by humans.

8
Carbon dioxide (CO2) is the most important
greenhouse gas.

• Carbon dioxide (CO2) is the most important
  greenhouse gas caused by human activities.
• Carbon dioxide (CO2) enters the atmosphere
  through the burning of fossil fuels (oil, natural
  gas, and coal), waste, trees and wood products
  and as a result of other chemicals.

9
Carbon dioxide (CO2) is the most important
greenhouse gas.

• Carbon dioxide (CO2) is emitted from cars,
  trucks, buses, power plants, from airplanes, and
  from buildings, and in the manufacture of cement.
• Carbon dioxide (CO2) emissions count for about
  55 of total Global Greenhouse Gases (GHG)
  emissions.

10
Methane(CH4) is the second most important
greenhouse gas.

• Methane(CH4) is emitted from the production and
  transport of fossil fuels. It is also emitted by
  livestock and as a result of agricultural
  activities (rice paddies), and by the decay of
  organic waste in municipal landfills.
• Methane(CH4) emissions count for about 16 of
  total global GHG emissions

11
Nitrous oxide (N2O) is also an important GHG.

• Nitrous oxide (N2O) is emitted during
  agricultural and industrial activities. Sources
  are from nylon and nitric acid production and in
  the use of fertilizers.
• Nitrous oxide (N2O) emissions count for about 9
  of total global GHG emissions.

12
Fluorinated gases are the least important GHG

• Fluorinated gases referred to as hydro
  fluorocarbons are synthetic gases (CFCs) produced
  from various industrial processes. These gases
  are produced in small quantities.
• Fluorinated gases emissions count for about 1 of
  total global GHG emissions.

13
Deforestation

• Deforestation is another important cause of
  Global Warming responsible for about 20 to
  carbon emissions into the atmosphere by the
  cutting and burning of millions of trees every
  year across the world.

14
Stop global Warming Now!

• How can we contribute to reduce the impact of
  Global Warming?