Humans Should Not Be Blamed For Global Warming

886 words - 4 pages

An increase in the Earth’s average surface air temperature is referred to as global warming. Global warming is part of a natural cycle and is not caused by an increase in Carbon Dioxide emissions from humans. Humans are therefore not responsible for global warming.
Global warming is part of a natural cycle of climate change. The Pleistocene describes the time period that spanned from 1.8 million to approximately 10 000 years ago. During the Pleistocene, significant advances of continental ice sheets in North America and Europe occurred. The Holocene Maximum was a time period that occurred approximately 11 000 years ago and it marked the end of the Ice-age. The temperatures then, were much higher than they are today. The time period between 900 and 1300 AD is known as the Medieval Warm Period ' where higher temperatures were documented in historical accounts. The Little Ice Age took place between the 16th to the mid 19th century. During this period the polar ice caps extended considerably further from the poles than they do currently. Accordingly it is acceptable to state that climate change and hence global warming is part of the Earth’s natural cycle.

It is alleged that global warming is ‘man-made’ due to it being caused by greenhouse gases (most notably Carbon Dioxide) that contribute to the ‘greenhouse effect’. The sun radiates shortwave radiation through the upper part of the atmosphere to the Earth. The Earth’s surface is warmed and the Earth radiates longwave infrared rays to space. Greenhouse gases absorb infrared radiation from the sun and radiate it back to Earth. The Earth’s surface is warmed by the reflected heat which consequently leads to global warming.

Man-made Carbon Dioxide emissions alone cannot be causing global warming as the oceans are the biggest source of CO2 by far. According to a documentary, The Great Global Warming Swindle, most of the warming occurred prior to 1940 and the world cooled during the post-war economic boom from the 1940s till the mid-70s. Thus it is not valid to state that global warming is caused by an increase in Carbon Dioxide as human emissions of Carbon Dioxide were relatively small before the 1940s. Ice-core data show that temperature variations precede rises in Carbon Dioxide present in the atmosphere. An explanation for this is that as the surface of the ocean gets cooler, the ocean absorbs CO2, and as the surface of the ocean gets warmer, it emits CO2. There is a time lag of approximately 800 years between the rise in temperature and CO2. This is due to the sheer size of the oceans. Since the oceans are so big, it takes centuries for the oceans to change in order to match the atmospheric temperature. The aforementioned reasons indicate that humans should not hold accountable for global warming.

The most prominent feature in our solar system is the Sun. It contains an estimated 98% of the total solar system mass and is the largest object in our solar system. Incontestably...

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