Environment and Global Warming
Global warming is a gradual increase in the average temperature of the earth’s lower atmosphere as a result of the increase in greenhouse gases since the Industrial Revolution. Much of the recent observed and projected global warming is human-induced. It is caused by man-made increases in carbon dioxide and other greenhouse gases through the burning of fossil fuels and deforestation. Adding carbon dioxide, methane and such other gases (that have the potential to absorb heat) to the atmosphere with no other changes will make our planet’s surface warmer. The atmospheric concentrations of carbon dioxide and CH4 have increased by 31 per cent and 149 per cent respectively above pre-industrial levels since 1750. During the past century, the atmospheric temperature has risen by 1.1°F (0.6°C) and sea level has risen several inches. Some of the longer-term results of global warming are melting of polar ice with a resulting rise in sea level and coastal flooding; disruption of drinking water supplies dependent on snow melts; extinction of species as ecological niches disappear; more frequent tropical storms; and an increased incidence of tropical diseases. A UN Conference on Climate Change, held in Kyoto, Japan, in 1997, resulted in an international agreement to fight global warming which called for reductions in emissions of greenhouse gases by industrialised nations.
As a result of global warming, by what rate atmospheric temperature rises?
Answer & explanation
Correct answer: option 1
The correct answer is Option (1) → 1.1° Fahrenheit
The passage gives the warming of the past century in both scales: the atmospheric temperature has risen by 1.1°F (0.6°C). Measured in Fahrenheit the rise is 1.1 degrees; in Celsius it is only 0.6 degree, which rules out both 1° and 2° Celsius, while 2° Fahrenheit is nearly double the figure.