How did global warming begin? This is a question which is certainly among the teasing questions one might ask. Global warming refers to an increase in earth’s temperature caused by the greenhouse gases. While this is one of the most major threats facing the earth today, there had been a point of time when it had started.
Temperature curves became steeper
During the late 1950s and the early 1960s Charles Keeling made use of modern technologies to produce the concentration curves for atmospheric carbon dioxide in Mauna and Antarctica. The curves became the biggest icons of global warming. The global annual temperature exhibited a downward trend between 1940s and 1970s. The ocean sediment research showed at the same time that there had remained a total of thirty two cold-warm cycles. The fear however associated was that an ice age about to come yet again.
Rise of annual temperature
The rise in the mean annual temperature curve of earth started to show a rise during the 1980s. During the late 1980s the curve started increasing steeply and the risks associated with the phenomenon started to show up. The scientists notified that the earth was then on the verge of undergoing a change in climate that would evidently have negative impacts on the world. The beginning of global warming had been first predicted by Stephen Schneider in the year 1976.
Greenhouse effect and change in climate
It was in the year 1988 when the scientists finally agreed that the climate then, had become warmer than any time after 1880. It led to the naming of the theory of greenhouse effect. World Meteorological Organization and United Nations Environmental Programme founded the IPCC, a panel studying the change in climate. The organization studied the impacts of the greenhouse effects based on the existing climate models. The reports about climatic changes were released by the IPCC in the years 1992 and 1996. The latest revised version has been provided in the year 2001.
Damage caused to the ozone layer
The beginning of global warming can also be attributed to the irreparable damage caused to the ozone layer, which prevents the UV rays of the sun from reaching the earth.
Greenhouse gases and their effect
Solar energy is radiated on earth by the sun and a large part of this energy, which is forty-five percent is radiated back into the space. The greenhouse gases contained in the atmosphere include nitrous oxide, ozone, carbon dioxide, methane, and water vapour. These gases cumulatively, through the process of adsorption contributed to global warming and the reflection of atmospheric as well as solar energy.
This gave rise to the greenhouse effect. And it was agreed then that the effect of the greenhouse gases correlated with the sudden increase in the average annual temperature of earth. Had the greenhouse gases not been in existence, the average annual temperature of earth would have been around 18 degrees. The conditions of global warming had been aggravated by the Industrial Revolution.
It is to be noted that the beginning of global warming brought about an abnormal rise in the average temperature of earth.