hello everybody my name is Zohir Chowdhury and today we will talk about sources of greenhouse
gases in order to understand the sources of greenhouse gases is it extremely important
to understand what combustion is so combustion is essentially when we burn fuel and fuel can
be anything that has carbon hydrogen oxygen that contains energy such as coal natural gas petroleum
oil gasoline fuel oil wood or anything that is made up of these organic chemicals so CH Oh carbon
hydrogen oxygen also know in this combination also known as fueled when it's burned in the presence
of oxygen it releases carbon dioxide and water vapor as well as heat energy this heat energy is
what we utilized and the byproduct of combustion is carbon dioxide and water vapor gases that are
released into the air as you remember from the other lecture carbon dioxide and water vapor
they are greenhouse gases they have greenhouse gas properties so by burning fossil fuel or by
burning fuel we can raise or we rescreen as gases such as carbon dioxide and water vapor so which
countries produce more greenhouse gases from very very long it has always been the United States of
America that produced the most greenhouse gases it used to produce about one-third of the greenhouse
gases for a very very long time but with over the last 15-20 years China has progressed tremendously
because of industries ation and many other things that have been happening in China and
for the last I think six seven or eight years China has overtaken the US and China right now
produces almost about one third of the global greenhouse gas emissions and us right now is
a second and here are the various industry that produce greenhouse gases so what are the major
agreement excuse me greenhouse gases and their sources so co2 methane and nitrous oxide this had
three major greenhouse gases that are that you'll hear over and over again each of this they have
a natural source around super genic source for example for carbon dioxide the natural source is
respiration all living organism we're aspire and we give off carbon dioxide decomposition
also produces carbon dioxide these are natural sources of greenhouse gases on the other hand
burning a fossil fuel produces a lot of greenhouse gases about 65 percent of all greenhouse gases
are from fossil fuel burning deforestation also removes the plants who like the plants in terms
they can observe the greenhouse gases such as carbon dioxide because of the photosynthesis
that plants - and burning of rainforests on the other hand produces more greenhouse gases
such as co2 land-use conversion also removes the greenhouse gases well like produces greenhouse
gases because you are converting let's say a forest areas into city or grassland into a
city and as a result you are removing the sync of co2 over time right now the anthropogenic sources
of greenhouse gases produce a lot more cleanest gases than the natural sources the next cleanest
gas is methane and methane is produced naturally from microbial activity in the absence of oxygen
so anaerobic microbial activity as well as in wetlands and another sources INBOX on the other
hand autopoietic sources of methane are coming from agriculture or animal husbandry especially
like when you're producing rice paddy it requires water to be in the roots of the rice which because
it produces an anaerobic environment in the roots releases a lot of methane from rice cultivation
as well as cattle release a lot of methane as well drilling for oil land filling biomass burning all
of this also produces methane as we do this more and more and more in fact entrepreneuring sources
for meth and accounts for 70% of methane produced annually all over the globe the last one that will
talk today is nitrous oxide it is produced from microbial activity in the soil on the other hand
ultrasonic sources are for fertilizer use a source from transportation fertilizer remember nitrogen
is used as a fertilizer so nitrous oxide comes out when you use fertilizer in that in the in
that in for agriculture so carbon dioxide methane and nitrous oxide they all have natural sources as
well as entrepot genic sources and with time right now anthropogenic sources are becoming extremely
important and I've actually overtaken the amount of these gases that are produced naturally and
because of this we are seeing this enhanced greenhouse gas effect that I talked earlier
that's true quick conception which of the two countries produce nearly half of the world's
greenhouse gases exactly a India and sorry US and China see US and China see thank you