Wondering which solar technology has the smallest environmental footprint? In recent years new photovoltaic technologies have nearly doubled the efficiency of solar cells. Yet production methods, whether from silicon, metal, or other material, raise doubts about their environmental friendliness. For example, purifying and producing silicon uses a lot of water and energy, whereas refining zinc and copper ores to get cadmium, telluride, and other elements creates metal emissions and an energy sink.

Now Environmental Science & Technology calculates the impact. They've released a life-cycle assessment of some of the leading photovoltaic technologies. Some appear better than others. You can read the pdf here.

The winner? Thin-film cadmium–telluride (CdTe) photovoltaics—with more efficient energy conversion and lowest costs.

Julia Whitty is Mother Jones' environmental correspondent and 2008 winner of the John Burroughs Medal Award. You can read from her new book, The Fragile Edge, and other writings, here.

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Julia Whitty

Environmental Correspondent

Julia Whitty is the environmental correspondent for Mother Jones. Her latest book is Deep Blue Home: An Intimate Ecology of Our Wild Ocean. For more of her stories, click here. RSS | Twitter