Nuclar plants are not a way to go... They actually do more damage in the long run. Also fuel rods are no longer cost effective when 5% of them is used up.
Which is why they are sent for reprocessing to remove the spent fuel and recreate new buttons for inclusion in zircaloy rods. Of the many solutions...I'd like to see an investigation on why solar cells are so expensive...and batteries for that matter. Simple technology...premium price.
Sorry, but I don't think that smog is going away any time soon. Until fusion reactors are created and in place, everything else is pretty much a stop-gap. Wind, hydro, thermal (really damaging potential) do not and probably will never exist in signficant quantities...solar would be great but it is expensive and around 12-15% effective (need a full spectrum cell) while living it's short life (10-15 years) before a very expensive replacement. Cost to take my 2,500 sq ft home off the grid....$185k...not going to happen.
A big help would be room temperature superconductors. If room temp superconductors existed then we would have an excess of about
35+% generating capacity in this nation....that's right, 'bout 35% of your electric bill is for power generated and lost in the lines due to heat.
This is where I think government is good; funding huge, ponderous research efforts that have the potential for mass benefit but which have exceedingly long lead times for a result that is not guaranteed. That supercollider in Texas that was scrapped in the 90's may have made a difference in understanding the physical that could have led to room temp s-c's (and other things) in our near future. Now we fund the European Supercollider...I've a cousin working there from DOE...dang shame we didn't follow through with ours. Sure wish the nation would step up and have a crash program like the space race on superconductors...the biggest bang for the buck that no one knows or talks about....just us geek engineers.