09d9bdb1_den__Solar_Cells_Versus_Leaves__The_Solar_Cell
[0] Environmental Impact [The Leaf] Leaves are grown using water, sunlight, carbon dioxide, and various soil nutrients. Leave decompose by themselves, contributing to soil richness. There are no heavy metal pollutants released in the process. Another interesting side effect of leaves is that they can be eaten by animals. [The Solar Cell] 
Creating solar cells involves the use of lead, mercury, cadmium and other toxic heavy metals. It also produces carbon dioxide, which contributes to global warming. Solar cells are nevertheless touted as a replacement for fossil fuel consumption.
Experiment Garden: Solar Cells Versus Leaves
The Solar Cell