There are a number of ethical issues with respect to cloning, mostly centered around human cloning. Animal cloning has received its share of negative publicity; however, the potential for human cloning has raised not only religious but also social and philosophical concerns as well.
The fact that cloning offers potential solutions for tissue and whole-organ transplantation and a chance of providing children to parents who cannot conceive has not deterred the opponents in their criticism of the technology. The ethical issues have hampered the development of cloning science across the globe. The scientists are, mostly, free to clone animals; however, human cloning or attempts at it are strictly prohibited in many countries, e.g., France, Germany and Switzerland. Several countries have banned cloning for reproductive purposes, but allow cloning research for therapeutic purposes. The United Nations called for a ban on human cloning way back in 2005. Federal funding for human cloning projects is banned in the US.
Thus, ethical concerns have adversely affected the development of cloning science (especially human cloning) by curtailing research money and creating negative publicity against it.