Engineering360: "Catalyst for Converting Atmospheric CO2"

Will someone explain me what's the advantage.

CO2 is there because someone has burnt carbon or hydrocarbon to extract energy from this combustion at an efficiency no better than 50%, probably much lower than this.

Now the idea is to convert CO2 back to a hydrocarbon at the cost of much more energy to perform the conversion.

If this development is for a future of cheap abundant renewable energy, it is Ok. Otherwise...