Causes of Global Warming
Climate change has been a reality since the nascence of the earth,
but man’s activities ever since the dawn of industrialization has sped
up that process of climate change. This is due to an undeniable and very
significant increase in the amount of greenhouse gases in the
atmosphere.
Human industry has resulted in large scale deforestation
and the burning of fossil fuel (oil, coal and natural gas) and wood
which has in turn led to increase in concentrations of carbon dioxide
and methane in the atmosphere. Other gases such as ozone and nitrous
oxide as well as CFCs and water vapor are also considered greenhouse
gases, which contribute to global warming by trapping more heat within
the earth’s atmosphere. Scientists have examined ice cores to find that
these methane and CO2 levels are higher than at any time of the past
800,000 years.
Our cars, factories, cattle rearing, agricultural activities (which firstly cause deforestation and then place a burden on the earth’s limited resources),
production of electricity, waste generation and consequent creation of
landfills, refrigeration and a host of other activities create
greenhouse gases and contribute to global warming.
Effects of Global Warming
Global warming affects not only us humans, but also every other creature on the earth.
Temperature records have shown that there was a rise in global
temperatures by about 0.6 degree Celsius in the past century. The
temperatures of the seas have risen and have had a dual impact: the
polar ice caps are melting and the average sea level is rising, posing
various threats not only to marine life but also human coastal
populations because of issues like coastal erosion.
The melting of glaciers has the worrying impact of
reducing water availability for many human populations. As sea
temperatures rise, they are less able to absorb CO2 from the atmosphere
and this is both a cause and an effect of the acidification of the
oceans of the world. All of this also means negative consequences for
ocean life including the bleaching of coral.
It isn’t just that temperatures have risen all over the world,
climate itself has become more unpredictable: the amount, intensity and
unpredictability of rain have increased. There is also evidence to
suggest that storms and hurricanes have become more
severe and destructive in the past 4 decades or so. Certain areas of the
world also experience more frequent and severe droughts.
Scientists have also opined that global warming could indirectly lead
to other problems such as malnutrition, the increase of disease and
epidemics due to possible drought and other natural disasters. Heat waves
and conversely cold waves have become more frequent and cause more
deaths than earlier. Incidences of bush fires have increased as has the
incidence of vector borne diseases such as dengue and malaria (because
warmer climates are more conducive for vectors such as mosquitoes,
flies, ticks etc).
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