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I have seen that today the earth's atmosphere has remained the same for the past 200 million years. Altogether, the earth's atmosphere consists of 78% Nitrogen, 21% Oxygen, 0.9% Argon, 0.03% Carbon dioxide, 0.0-4.0% Water vapor and very small amounts of trace gasses.
The earth's climate is changing. Carbon dioxide levels are higher than they have been. These levels threaten the planet's temperature. The temperature is rising, snow and rainfall patterns are shifting, and various extreme climate events – like heavy rainstorms and record high temperatures – are happening.
The ozone levels protects life from the suns radiation. The atmospheric levels of ozone depleting substances promptly increased prior to the applying of the Montreal Protocol on Substances that Deplete the Ozone Layer and its following revisions and amendments. The atmospheric levels of all these elements has diminished extensively over the past 20 years.
Our earth is getting warmer and warmer. The average temperature of the earth has increased by 1.5 degrees Fahrenheit over the previous century. As mentioned previously, this resulted in large and potentially dangerous shifts in climate and weather. I have seen floods, droughts, severe rain and commonly heat waves.
Due to the change in climate Greenland's ice is melting. In 2012, it saw a record melt! This melt was provoked by the arrival of uncommonly warm air and magnified by the presence of a blanket of thin low-level clouds which increased temperatures up above freezing.
Believe it or not, these changes are caused by our everyday actions. The pollution caused by are cars are a huge factor in global warming. In addition, the electricity we use in our homes, schools and work places leave a big dent on our atmosphere.
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