Greenhouse Effect and Ozone layer Video Lecture - Class 9

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very very bad
very very bad you bad human do you know
why you were punched in the face okay
let me tell you you were punished
because you are causing global warming
do you know what global warming is but
first clean your tears take this hankie
to understand global warming you first
need to understand the greenhouse effect
do you know about the greenhouse effect
oh you're thinking about a house which
is green hmm don't act like a stupid
there are a few gases in atmosphere like
carbon dioxide methane nitrous oxide
these are called greenhouse gases these
greenhouse gases are good if they are in
right quantity these greenhouse gases
form a layer around earth when rays of
sun come and fall on earth some of them
are absorbed by earth but most of them
reflect back to the atmosphere these
reflected rays reach upper atmosphere
their greenhouse gases take most of the
heat from these rays some of the heat
goes into space the heat captured by
greenhouse gases spreads in every
direction these heat which has been
trapped by greenhouse gases helps to
keep our earth warm if heat of Sun is
not stopped by these greenhouse gases
our earth would freeze an average
temperature would be 18 degrees Celsius
so these gases are good for Earth's
survival otherwise plants animal and we
humans would have no life here this
stopping of Sun heat to keep earth warm
is called greenhouse effect
so greenhouse gases are good they trap
the heat so they help earth to have nice
temperature so that we all can live here
happily do you know what we humans are
doing we are increasing the amount of
these greenhouse gases we have smoke
coming out of vehicles smoke coming out
of factories in this smoke there is a
lot of methane lot of carbon dioxide
which are greenhouse gases also do you
know trees and plants breathe in carbon
dioxide
gasps thus reducing it from atmosphere
and keeping a balance of greenhouse
gases but unfortunately we are cutting
trees too so there are less plans to
absorb greenhouse gases but more cars
and factories to increase these gases
when these greenhouse gases become more
and more in atmosphere the layer of
these gases become more and more thick
so when sunrays come down and get
reflected back by earth they reach this
thick layer of greenhouse gases all
these heat rays get trapped nothing goes
up in the space temperature is
increasing earth is becoming warmer this
is called global warming so now you know
why you got punched you like all of us
are also responsible for global warming
oh it is too hot today good you have an
umbrella
you know umbrella not only saves us from
rain it also saves us from sun rays but
do you know there is bigger umbrella
made by nature in the sky in earth
atmosphere there is a layer in
stratosphere it is called ozone layer it
is about 15 kilometers above the Earth's
surface
this is umbrella of the earth it
protects our Earth from ultraviolet rays
Sun sends many kinds of rays towards all
planets out of those ultraviolet rays
are very dangerous for plants and humans
ultraviolet rays are also called UV rays
ozone layer umbrella absorbs these rays
and protects the earth this ozone layer
umbrella does not allow ultraviolet rays
to come to earth and harm us do you know
the harm of ultraviolet rays these can
cause skin cancer eye cataract sunburns
and less plants do you know we humans
are destroying this umbrella by using
old kind of air conditioners old
refrigerators fire extinguishers spray
cans we are spreading gases called CFCs
these CFCs gases destroy ozone layers by
reacting with it ozone layer is getting
badly affected by the CFC gases there
are now holes in ozone layers so
protective umbrella has no holes so if
there are holes in umbrella
UV rays would directly hit the earth so
we humans would have less plants more
diseases don't worry we can protect the
ozone layer by using things which don't
have CFCs