00:01
Hello students, this question says, has human activity caused the world climate to change over the past 100 years? so human activities such as burning fossil fuels, deforestation i .e.
00:30
Cutting off forest or industrial processes, all these have increased the concentration of greenhouse effect.
00:54
All these industries produce harmful oxides which play a major role in depleting of the ozone layer which cause the human, this cause global warming.
01:16
Now the greenhouse gases, these greenhouse gases such as carbon dioxide, methane and nitrous oxide, these are trapped heat in the earth's atmosphere leading to warming effects that is known as greenhouse effect.
01:55
Now due to this greenhouse effect, this resulting change in reflecting the earth's surface that emission from the burning forests, urban heat, island effects and change in the natural water cycle and thus cause our earth.
02:18
It is concluded that the greater than 95 % probability that human activities over the past 50 years have warmed our planet.
02:43
So the global average temperature has increased about, this increased about 1 .2 degree since the last 19th century with most of the warming occurring in the past 35 years...