pollution from truks,factoreys,cars,trains,fires and buses are effecting the ecosystem
Dust and sand storms do not destroy deserts, they simply rearrange the substrate a bit.
Yes, people have a variety of occupations in the deserts.
If you want to destroy a city and kill thousands of people, it is the quickest way of doing so.
Austria has no deserts.
Some deserts, such as the Thar Desert, have relatively dense populations of people. Some deserts have few people. Each deserts has its own statistics.
Although Haiti does not have any deserts it is deforested with trees
yes
Some people destroy things to let anger out and think it is funny when then destroy other people's or their things.
they can destroy worlds and people
by pollution and destroy the land
Most people who live in deserts live there because they like the desert. I live in a desert and love it.
By 'they' I assume you mean people. Yes, millions of people around the world live in deserts, including the author of this answer.