The net impact of solar panels actually temporarily increased carbon
dioxide
(CO2) emissions, due to how much energy is used in their
construction, a study published in December 2016 concluded. The solar
industry has been "a
temporary net emitter of greenhouse gas emissions," and more modern
solar panels have a smaller adverse environmental impact than older
models. Scientists estimated that by 2018 at the latest, the solar
industry as a whole could have a net positive environmental impact.

of course the amount of energy used/C02 created in the construction of a
nuclear facility, the mining and processing the uranium, the processing
and storage of nuclear waste, the energy used in guarding the nuclear
fuel and waste, and best of all the energy used in deconstructing the
plant when it is decommissioned, the storage of that nuclear waste...and
the cost of taking care of the miners and workers affected by extreme
irradiation is obviously of no concern