In the following video, Fool contributor Matt Thalman discusses a topic affecting all investors: deciding which companies meet our personal moral guidelines.

Matt says that while many companies and industries may appear morally upstanding on the surface, things can change when they're viewed from a different perspective. For example, some consumers may be outraged by how much money they pay to utility companies every month, but the moral dilemmas can go much deeper when looking at things like the environmental damage caused by coal-fired power plants, or the threat posed by nuclear reactor malfunctions and the disposal of spent fuel rods.

As investors, Matt says, we all need to decide what we consider moral or immoral and then decide which companies to support accordingly.