That they have a useful life of only about 20 years and that the costs of trashing them has not been factored into solar power costings.
By contrast a nuclear power station has a useful life around 80 years and the handling of waste is something that's mentioned every time we talk of nuclear power and, moreover - despite the scaremongering by greenies - has been solved.
The commenters on this article suggest that in time the waste solar panel issue will be solved. Which it may well be. It's still a cost that I've not seen commonly factored in to solar power costings.
