Finding new planets with climatic conditions enough for the survival of humans has always been in the prime focus for the research and studies related to astronomy.
The solar system houses innumerable potentially habitable planets but a planet with a climate stable enough for survival has not resurfaced yet. Because of this reason, the planets do not support intelligent and life forms, Fermi Paradox, could be unable to adapt to rapidly changing climate and fluctuation.
It is a natural phenomenon that the surface temperature of the planet rises over time. As the sun aged and its surface temperature increased by 4 percent, the Earth would have warmed continuously for the past 4 billion years and since the beginning of life on our planet, the temperatures could have shot up by 100 degrees. However, Earth has survived and sustained its life forms through a vastly spread plant cover, which has drastically altered the chemical composition of the atmosphere and the natural greenhouse effect.
The plant life that emerged 400 million years ago was supported by geological changes, thereby bringing the temperature of the atmosphere down to a level suitable for life on the planet. This geological evolution gradually surfaced as an advantage over other planets, which do not have a stable climate, providing an environment where intelligent life could thrive.
It was earlier thought that planets this huge would have a thick atmosphere that would lead to inhabitable conditions. However, the recent discovery of Mega-Earth, a rocky planet 17 times more massive than the Earth but a thin atmosphere has given rise to an interest in the possibility of inhabitation on other planets yet again.
Even though not only are Earth-sized planets common but so are multiplanet systems containing potentially habitable worlds, the evolution of alien life may be hampered by the extreme climates of other planets, as a result of which we may not ever have any inkling about their existence.