Essay on Global Warming: Humans Are Destroying the Planet

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Everyone knows that global warming is a serious environmental health problem with its effects reflecting on nature and all of mankind on Earth since the mid-twentieth century – emission of concentrated greenhouse gases, rise of sea levels, melting of polar ice caps, and increase in global surface air temperature. The rise in global surface air temperature causes frequent droughts in dry areas and accelerated ocean warming and hence the rapid increase in sea levels and melting of the polar ice caps. Natural disasters from the unpredictable weather patterns were also observed over the past few years. With these effects in mind, we know that the biodiversity of wildlife is greatly affected. But how exactly does global warming present a threat…show more content…
(Derocher, Lunn and Stirling 163-164). Based on the United States Geological Survey (USGS) studies, species such as the polar bear is an example of pagophilic mammals. Polar bears prefer habitats near the continental shelf and with sea ice partially covered, “likely due to higher biological productivity (qtd. in Dunton et al. 2005 2 ), and greater accessibility to prey in near shore shear zones and polynyas” (qtd. in Stirling 1997 2). These species are in danger because their habitat is affected by the change in climate which is melting the sea ice. Not only are their homes being melted away, this also means that there are warmer waters which affect their productivity in its marine environment. Global warming causes a longer duration of summer season in the North, where polar bears are restricted to relatively unproductive warmer Arctic waters which reduce its survival rate and may eventually reduce populations. (qtd. in Derocher et al. 2004). The polar bears’ main diet consists of hunting fishes and seals; with warmer waters the migratory patterns of fishes change – phocid seals do not necessarily use sea ice in the summer (qtd. in Harwood and Stirling 1992); their food source turns scarce, forcing the polar bears to move to other
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