To make this alternative butter, you don't need land, livestock, or crops.
A California-based startup called Savor has figured out a unique way to make a butter alternative that doesn’t involve livestock, plants, or even displacing land. Their butter is produced from synthetic fat made using carbon dioxide and hydrogen, and the best part is —- it tastes just like regular butter.
Fat and oil production from animal and plant-based sources are collectively responsible for about 3.5 billion tons of CO2
You cannot be serious that animal-based and plant-based are grouped in this figure. Plant-based is likely close to carbon-neutral, and only not net-negative, because of transport, cooling etc., which will also be necessary for this artificially created fat...
How plant-based compares to this new process still needs to be seen for sure. If it's just a machine you can plug in at the store and everyone can get their butter like out of an ice cream machine, without transport and cooling chain, then it's likely a lot better.
But at this point, I don't expect the process to be much more efficient than what plants are doing, which means you'd still need a ton of energy and particularly also land area for it.