Spoiler Thread: Avengers Infinity War

Which one of the infinity stones gives the power to materialize things?

Reality stone gives the power to manipulate matter or convert from one thing to another. What matter are we going to convert to double the matter across the universe? And if we do such a thing how will that then change the physical/natural complexity of a Planet and solar system such as Earth, who depends on Jupiter as protection from interstellar projectiles? So is it not a much simpler solution to just reduce the # of mortals consuming a finite amount of resources than it is to screw with reality itself?