The law of unintended consequences has hit hard in green energy and natural gas lately. Windfarms are being found to cause issues with the people who live near them; solar panels shift the pollution to the wafer fab from the power plant, nuclear energy has stopped dead, biomass just raised the price of corn and therefore meat and eggs...see what I mean?
And in the natural gas world, fracking has come under incredible scrutiny because the links between fracking using treated water and mud have been proven to cause earthquakes and water pollution.