8. Abortion is wrong. Killing babies before they are born is horrible. Once they are alive, however, they are fair game.
As for #7, while YOU think that, each has minuses that millions upon millions of people already oppose and would hate you for. Cloning? An incredibly amount of moral issues with that. Especially if it was cloning for the purpose of labor and such. Either way, many people think that's wrong, including me. You couldn't just suddenly say cloning was O.K.
Nuclear power... Already exists in certain places, but there are so many risks... Essentially, that most likely wouldn't become very popular unless someone developed a new, safer method of producing it.
And as for #8, you can't say that. Yet again, there are an incredible amount of ethical, moral, and religious issues. Christianity says that abortion is just plain wrong, no matter at what stage. Judaism, however, while not encouraging it, says that if a mother can't really handle it, like she's raped or couldn't handle it in her life, would allow the mother to do that. All different religions and people have different views on that, and just saying no to abortion, again, would be a biiiig no-no.