The climate is one of the Earth's fundamental life support systems. It is generated by four components:
The atmosphere (the air we breathe); the hydrosphere (the planet's water); the cryosphere (the ice sheets and glaciers); the biosphere (the planet's plants and animals). We human beings bu our actions we have long back started modifying this climate.
The emissions of carbon dioxide modify our atmosphere. The trees take away that co2 and give us oxygen. But we have started killing trees.
Our water use increasing beyond control and hence this had started to modify our hydrosphere.
Rising atmospheric and the sea-surface temperature had started to modify the cryosphere, most notably in the unexpected shrinking of the Arctic and Greenland ice sheets.
Our increasing use of land, for agriculture, cities, roads, mining – as well as all the pollution we were creating – had started to modify our biosphere.
So we can say we had started to change our climate. As such there may be a chance that humankind may not exist on this planet Earth. So we have to think of various means and ways to survive on the planet.
In that pursuit, the man started exploring The moon and The mars. But so far no positive steps are seen. However, we can still expect some favourable leads in that direction. At least till an alternative is found the human beings should mend their ways and protect the environment on the earth so that the existence will not be a threat.
If pressurized spaces can be built on the Moon or Mars, in underground lava tubes or caverns, it would be possible to have them contain biospheres with self-sustaining ecosystems?
Within a habitat enclosure, you'd have your vegetation in some facsimile of a natural looking environment. You'd also have a power station to provide artificial light and heat, as well as water filtration and air purification. What other inputs do you need as a prerequisite for a self-sustaining ecosystem?
Some work is going on in some countries. But it will look maintaining an aquarium with some pets in our house but it is not as simple as such. How many millions of dollars are required and even after that for how many we can create. Likewise many questions which can't be answered easily.
The best way is to conserve the available God's gift than doing futile attempts for an artificial environment6 creation for the sustenance of human being.