Simply Nitrous oxide that the article points out. Nasa

Simply put the
national graphic explain global warming as the average global temperature increasing. The article states that this
average temperature is caused by gases that trap heat form the sun. National geographic(2017) says:

            “the greenhouse effect” is the warming that happens
when certain gases in Earth’s atmosphere trap heat. These gases let in light
but keep heat from escaping, like the glass walls of a greenhouse.” 6

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How these greenhouse
effect works are that the sunlight enters
the earth’s atmosphere where some of the light
energy radiates as heat in the atmosphere. What the greenhouse gases do is that
they trap the heat energy from escaping earth. From the National Graphic(2017) source, I learnt that scientist knew about this
so-called greenhouse gas effect since
1824, where Joseph Fourier had worked out that the earth should be a lot colder
but did not have the means or technology to know why the earth was hotter than
it should be. Then Swedish chemist Savante
Arrhenius discovered that us humans could affect the greenhouse effect by
producing more carbon dioxide. I also found out that Co2 was not the only
Greenhouse gas. There are several  more
greenhouse gases and that includes methane.  8

NASA (2017)  continue
to say that “Methane. A hydrocarbon gas produced both
through natural sources and human activities, including the decomposition of wastes
in landfills, agriculture, and especially rice cultivation, as well as ruminant
digestion and manure management associated with domestic lives”8

they committee that methane is a
much more active greenhouse gas than carbon dioxide but luckily it’s far less abundant in the earth’s atmosphere. Another main greenhouse
gas is a
Nitrous oxide that the article points
out. Nasa (2017) says that it is a very
strong greenhouse gas “produced by soil cultivation practices, especially the
use of commercial and organic fertilizers, fossil fuel combustion, nitric acid
production, and biomass burning”. Nasa (2017) also points out
Chlorofluorocarbons (CFCs) as being another contributor to the greenhouse gas
effect. The source of these CFCs is
origins is completely human, and they are very good at destroying the ozone
layer. Which is a layer in the atmosphere
that protects us humans from dangerous cosmic rays in the first place. the increased rate of these greenhouse
gases being released into the atmosphere
is mainly man-made. The thing that causes
global warming is human activity.8

“the
Intergovernmental Panel on Climate Change, a group of 1,300 independent
scientific experts from countries all over the world under the auspices of the
United Nations, concluded there’s a more than 95 percent probability that human
activities over the past 50 years have warmed our planet.”8

The evidence that
humans cause global warming is resounding.
From NASA they say that “atmospheric
carbon dioxide levels from 280 parts per million to 400 parts per million in
the last 150 years.”8 And that panel of scientist also say the “human-produced
carbon greenhouse gases… have caused much of the observed increase in Earth’s
temperatures over the past 50 years”. How do we know it’s human-made. In the NASA (2017) article, they say

            “The
planet’s average surface temperature has risen about 2.0 degrees Fahrenheit
(1.1 degrees Celsius) since the late 19th century, a change driven largely by
increased carbon dioxide and other human-made emissions into the atmosphere.
Most of the warming occurred in the past 35 years, with 16 of the 17 warmest
years on record occurring since 2001. Not only was 2016 the warmest year on
record, but eight of the 12 months that make up the year — from January through
September, with the exception of June — were the warmest on record for those
respective months.”8

Why
is global warming such a concern?

WWF says” Burning fossil fuels, such as coal, oil
and natural gas, to generate energy has the greatest impact on the atmosphere
than any other single human activity.” They support this statement by stating “Globally, power generation
is responsible for about 23 billion tonnes of CO2 emissions per year – in
excess of 700 tonnes every second. Coal is especially damaging to our atmosphere,
releasing 70% more carbon dioxide than natural gas for every unit of energy
produced.”15 So humans cause global warming and the biggest
cause of it is our burning fossil fuels for energy so we can
better our lives. However, the cost of bettering our
lives is much more than the electricity bill. Economically the cost of the
earth getting hotter could cost the planet about $21 trillion by 2050 says
Johnston of the independent.  Another
problem of climate change is that “crops, natural vegetation, and
domesticated and wild animals (including seafood) that sustain people in a
given area may be unable to adapt to local or regional changes in climate.” States
Riebeek of the earth observatory department at NASA. 8

Another major concern
is that Ice sheets are melting. Live Science says that “The ice sheets have
been retreating since the end of the last Ice Age about 11,700 years ago, but
the last century’s warming has hastened their demise.”4  A 2016 study found
that there is a 99% chance that it was global warming that was causing the accelerated
demise of the Ice Sheets. Infect the
study found that Glaciers( rivers of ice) retreated 10 to 15 times the distance
if climate change wasn’t a thing. But what’s the big deal with melting ice? The problem is that it can cause a lot of
human life. “The loss of glaciers can cause the loss of human life when icy
dams holding back glacier lakes destabilize and burst, or when avalanches
caused by unstable ice bury villages,”
says Live Science. The problem isn’t just with ice getting hotter its hot dry
places getting hotter and drier. 4