Why does everyone always point out that they "don't produce CO2" nowadays, when all they do is shove the CO2 production over the horizon, into someone else's yard?
Gasification technology, by contrast, converts nearly all of the waste into gases like hydrogen and carbon monoxide that can be used to run generators and furnaces
So instead of burning it (producing CO2) and generating energy locally, they produce carbon monoxyde that can be burned (producing just as much CO2) somewhere else, and suddenly they're "clean".
There is a benefit to using waste: if you just let it rot you get CO2 as well, so it's not a bad idea to gain some energy in the process. But gasification isn't any cleaner than other methods for getting energy out of waste.
There is a benefit to gasification, just in that you can use the gas somewhere else, closer to where the energy is needed. But mentioning CO2 as if it magically disappears is hypocritic.
A different topic maybe, but electric cars are just the same: no, they don't produce CO2. The CO2 is produced in the electricity plant that generates the current to charge your batteries instead. Or in a nuclear plant, creating its own kind of problems. And a small but growing part in clean alternative plants.
The net effect of a "clean" electric car is that the energy has to come from somewhere else, shifting the responsibility for doing it in a clean way to someone else. Electric cars aren't clean, they're hypocritic.
It's not just car manufacturers and waste gasifiers, many are making themselves "clean" today by saddling someone else up with the problems.