First, nuclear power plants require recirculating water, usually from the lake on which it is built, to provide the heat sink to cool the turbine-driving steam emitted from the water that was heated by the fission reaction. Have you swam in a lake on which a power plant is located? It's like bath water. Heating the Artic water that much would melt ice much faster than global warming, and is something Prof. Wong will have to take into account. (which I'm sure he has)
Second, how does Prof. Wong control the ionization process. That is, how does he plan to selectively ionize CO2 and not water, or oxygen, or ozone. What is the mechanism of ionization? Is it radical ionization? Radical decomposition of ozone is the mechanism by which CFCs were shown to be causing the ozone hole. Cl[dot] takes O[dot] from O3 to from ClO and O2. If the ions produced by Prof. Wong's proposal hits ozone instead of CO2, I could imagine this process becoming accelerated. How has Prof. Wong proposed selectively ionizing only CO2?
Third, in the microwave proposal, am I assuming correctly that the microwaves provide energy to the carbon dioxide which is converted to kinetic energy which the carbon dioxide uses to increase translational speed such that the molecule reaches escape velocity and exits Earth's atmosphere? Again, how does he propose to selectively irradiate CO2 and nothing else? And how much energy is needed to propel a molecule to escape velocity. I imagine it is not a trivial amount. If it were a trivial amount, those molecules would likely have already left the atmosphere naturally. Additionally, how do you control the conversion to kinetic energy and not to heat? That is, how do the microwaves selectively accelerate the molecules and not just heat them? Carbon dioxide is not polar, so Dielectric heating is probably not operative, but the water molecules surrounding the carbon dioxide could easily become heated, and could transfer that heat to the carbon dioxide (and anything else within collision distance).
Need to see more scientific details, please.