Human Activities Contributing to Global Warming and Its Effect on Polar Bears

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Global warming is the change in the earth’s climate over a period of time. It is
characterized by an increase in temperatures. This has mainly been contributed by the human
activities all over the world. These activities mostly involve the release of greenhouse gases like
carbon dioxide, nitrous oxide as well as methane. For example, in the recent studies, it has been
predicted that the temperatures on the surface may rise from 0.3 ̊ to 1.7 ̊ in the lowest place
scenarios and 2.6 ̊ to 4.8 ̊ in the highest scenarios ( McCright et al,155). Several human activities
that have led to this periodical change in climate and the effect to polar bears are discussed
below.
The industrial revolution has been using power machines powered by fossil fuels. This
means that everything we use has used fossil fuel at some point. For instance, when we buy a
car, the process of coming up with the car involves machines that use fossil fuels resulting to the
production of carbon dioxide and monoxide released into the atmosphere (Cox,184). The cars
themselves also release carbon into the air from their exhausts (Crowley,270).
In agriculture and from animals, there is the emission of methane. It is ranked second
worst after carbon dioxide. Bacteria break down organic matter in less oxygen dominated areas
to produce methane. Sometimes, this occurs in the bodies of herbivores, yet the population of
this animals is the high hence increased amount of the said gas in the atmosphere. Methane

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clathrate found in the ice`s crystal structure is also another source of methane. When methane
escapes the seabed of the Arctic, it greatly contributes to the increase in global warming.
Transportation is also a human activity. The increase in human population has led to
increasing in demand for many more cars and products consumption. This leads to using more
fuel for transportation and manufacturing. This fuel is then emitted to the atmosphere in form of
greenhouse gases which have an adverse effect on the climate.
Mining also contributes to climate change. Mining is the extraction of minerals from
underground. During this process, methane is trapped underneath. Rearing of cattle also leads to
trapping of the methane below the earth as it is also released from the manure. This gas leads to
the destroying of the ozone layer hence increased temperatures leading to change of climate.
The burning of fossil fuels is an activity that lets carbon out into the atmosphere. The
carbon is also from industrial activities that include manufacturing of cement and flaring of the
natural gas. These fossil fuels are important to the human because they provide energy used for
transportation, cooling of buildings, production of electricity, heating and most industrial
activities. Oil and coal are mainly used for these purposes. The dramatic increase in emission of
gases is mainly occurring due to activities going on in the developing nations like urbanization
and industrialization. China is a very good example. Its industrial activities in order to export
goods have led to increased emissions from that country (Jacob et al,51).
Deforestation is the cutting down of trees without replacement. Cutting of trees is done to
produce wood, build, make timber and papers. Logging of trees is not good for the climate
because when it happens, the carbon that was being stored by those trees is released into the air.
Once it is in the atmosphere, it intermingles with other greenhouse gases that contribute to global