Why do human beings live only on earth?
Because liquid surface water is found only on earth.
One answer to your question is: the angelic beings were created before the Earth of a non dust material. This creation was of a different elemental make up. Genesis1:16 describes them as greater and lesser lights. These light beings were the same beings who fought in heaven Revelation 12:7. These light beings "angels" personify in a etheric - to light - to human form.
Saturn, like the other gas giant planets (Jupiter, Uranus, Neptune), is a huge ball of hydrogen and other gases, and not a planet you can walk on or live on. The only ways to reside on Saturn would be in an orbiting satellite, or in a pressure dome on one of its moons (incredibly cold and with no breathable air).
One argument against is that it involves experimenting with the health and safety of human beings. An argument for is that although effects of drugs on animals may be similar to their effects on humans, some effects may be specific to human beings only. Another is that testing drugs on human beings may result in unexpected negative results for the subjects.
Protecting human beings from global warming is practically impossible. We cannot dig caves underground or build whole nations under the ocean for people to live. The only thing we can do is to slow or stop global warming. We have to stop relying on fossil fuels and thus stop putting CO2 into the air, and we have to plant billions of trees, the only way at present to remove CO2 from the atmosphere.