The rapid average rise in planet's temperature is termed as global warming.
Debate is that, global is a reality or just a myth? About 97% of scientists believe that global warming is real. People who believe that global warming is just a myth most probably say that the temperature changes with time and it is natural phenomena. Here a question rises that if it is a natural phenomena so why it is so rapid? Why Earth's average temperature is increasing so dramatically?
HISTORY:
Industrial revolution began in 1760 - 1840 and global warming was first observed between 1850 - 1900. The concentration of major greenhouse gas, Carbon Dioxide (CO2) was about 280ppm or less. Now, it has crossed 420ppm. This can't be natural.
STATISTICS:
Let compare the rise in CO2 concentration rise with rise in Earth's average temperature.
If you analyze both of the above graphs then you will see abnormal and dramatic rise in Carbon Dioxide concentration and average temperature rise of Earth after 1970 onwards.
Period of industrial revolution was 1760 - 1840, this was the time period when world learnt how to form industry. This period doesn't include heavy industries, producing a large amount of pollutants.
Industrial revolutions include steam engines, light bulbs, electric generators, electric motors, telegraph and telephone etc.
Temperature is increasing dramatically because of increase in greenhouse gases, major greenhouse gas is Carbon Dioxide, so these gases are trapping more, unwanted, rays coming from Sun and thus increasing average temperature. Increase in GHGs is because of human activities.
Natural causes like volcanic eruptions are not able to describe dramatic rise in Earth's average temperature.
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