The main cause of global warming is by the external causes of SUN and planetary effect rather than man made causes. Global warming has finally been explained due to the Earth is getting hotter because the Sun is burning more brightly than at any time during the past 1,000 years, according to new research. The measurement of radiation energy, ozone, ultraviolet rays and other parameters made using the instruments deployed in the spacecraft going to outer orbit of Earth for space mission to Mars, Venus ,Jupiter, Saturn , etc. has confirmed the role of SUN in the global warming. Global warming by the SUN has also been established in other planets like Venus, Mars , Jupiter and Saturn. The orbital axis change of the Earth’s rotation around the SUN also plays an important role in global warming by SUN. The other hypothesis given by Scientists for global warming of Earth by man made causes is simply the correlation of observed data of gases like CO2, methane, sulpher hexafluoride, water, ozone, nitrogen trifluoride, hexafluor and fluorinated gases, etc.; and there is no science involved in this. Here, we present the man made causes and its effect , as pointed out by scientists. This point is very weak to believe the global warming by man made causes. The only strong point is the cause by SUN and the orbital change in Earth’s rotation axis only.