There are definitely concerns; how valid these concerns are is a matter of some debate.
There are alot of safety concerns when using a hang glider. There are concerns with thermal and wind currents, which can not be helped. Theses concerns has resulted in fatal accidents.
viruses & other malware privacy health concerns environmental issues
colics
supply? demand?
Penis
I want to be a chimney sweeper. What are some of the health and safety concerns for chimney sweepers?
There are many concerns travel companies have about age requirements. Some of these concerns include finances and whether the individual is mature enough to travel.
globel warmingg
there are andegered species.
Its mostly just the ethics of it, but some concerns are unwanted mistakes and mutations, as well as fear that were messing with the natural cycle of reproduction and natural selection and such.
there is no concerns Not everyone would agree with this. People tramping around and maybe infecting the penguins with some disease are some of the issues.