Greenhouse Effect and Global Warming
Today, at the down of 21st century, together with the 20th century, especially the second half, is the time when Earth’s environment change at the very rapid rate. Humans have lived on this planet for thousands of years. I think now is the time to think how do we impact the place where we live, and the only place where we can live. The impact of human race on the natural processes of our planet has now reached the levels that are now global, not local anymore. This impact is accelerating day by day. Today, we have plenty of scientific evidence to prove that our planet together with human race is in great danger. The turning point was discovery of ozone hole in the 80’s, so all the events that maybe have past unnoticed previously are now not just under the close eye of scientists but the public too. The reason is that scientists have proved their pessimistic predictions of the future and that politicians and world media are putting a great pressure on the topic that the Earth is threatened by people and that we can not just stand still but we have to do something about it. One of the biggest threats of our time is the Global Warming. The most important fact for the beginning of discussion of this problem is to separate the Global Warming from the Greenhouse Effect. They are often being mixed and Greenhouse Effect is usually being related to negative connotations. Term “Greenhouse Effect” was first used by atmospheric scientists in the early 1800s. “It was used to describe the naturally occurring functions of trace gases in the atmosphere and did not have any negative connotations.” Than in the mid-1950s this term was related with concern over climate change. [pic]
This effect occurs because “greenhouse gases allow incoming solar radiation to pass through the Earth's atmosphere, but prevent most of the outgoing infrared radiation from the surface and lower atmosphere from escaping into outer space. This process occurs naturally and has kept the Earth's temperature about 60 degrees Fahrenheit warmer than it would otherwise be.”(www.epa.gov) The greenhouse effect is very important because current life on Earth would not be possible without the natural greenhouse effect. Planet Earth would not be warm enough for people to exist. On the other hand if the greenhouse effect becomes stronger than it should be, Earth will become warmer than usual. Concerning fact is that even a little extra warming can cause natural disasters for humans, plants, and animals- the complete Earth’s life. The main reason for the Greenhouse Effect are gases like water vapor ([pic] ), carbon dioxide ([pic]), methane([pic]), and nitrous oxide ([pic]). They all act as effective global insulators. In order to classify Earth regarding the planet warmth we can use the Goldilocks Principle which says that -"Venus is too hot, Mars is too cold, and Earth is just right. A Venus-type atmosphere would produce hellish, Venus-like conditions on our planet; a Mars atmosphere would leave us shivering in a Martian-type deep freeze.” Because average surface temperature of Earth is between boiling point and freezing point of water, our planet is capable of preserving the living world. Moderate temperatures made by Greenhouse Effect on Earth are also the result of having just the right kind of atmosphere. [pic]
Global Warming on the other hand is a just an increase in the Earth’s average temperature. The alarming fact is that Earth’s average atmosphere temperature has increased in the last decades. Nobody can tell for sure why, maybe it is a natural process, but a lot of scientists suspect that it is a consequence of the human act, in other words increased percentage of greenhouse gases produced in industrial chemical reactions that started since the Industrial Revolution. Earth is warming up and scientists say that rapid change in temperatures will lead to severe...
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