Question

what is one environmental concern associated with natural gas extraction and fracking? groundwater contamination low pollution emissions low sulfur emissions low energy density

Explanation:

Fracking involves injecting fluids underground. This can potentially lead to groundwater contamination if the process isn't properly managed. Low pollution emissions and low sulfur emissions are more like benefits (not concerns) related to natural - gas combustion in some cases. Low energy density is more of a technical characteristic related to the energy content per unit volume or mass of natural gas and not a direct environmental concern associated with extraction and fracking.

Answer:

groundwater contamination