It would be much cleaner for one thing. There would be only natural air pollution, from volcanoes, impacts, etc.
If Antarctica never existed, then it never would have existed.
Dinosaurs went extinct long before humans existed; the two would never have met.
Nothing would happen. If pizza never existed, we would simply be eating something else.
Communism (classless stateless society) has never existed.
Who knows what would happen?
Ozone is very beneficial to human beings. If no ozone was there, humans would not have existed.
Travelling would be very slow.
probably
forgetful
it would have boiled away into the atmosphere
people would be really sad
----------------------- There ought to be fossils of humans this size if they existed, particularly if they existed in the Near East, where extensive digs have been carried out. However, no evidence has ever been found of humans twelve feet high. If humans twelve feet high ever lived in settlements or towns, there ought to be some evidence of buildings such humans would be capable of living in, or artefacts that such a giant would have used, but not a fragment of evidence has ever been found. Scientifically, humans have never approached this height. The Qur'an does talk of the giant, Goliath, as does the Bible. However, there is no reason to believe that Goliath ever existed outside the holy scriptures.