If you want your nice smart phones you'll just have to accept the environmental destruction that goes along with it. Corporations like Siemens will live through wars and famines and the heat death of the universe, probably. this, and vibrating trees, here .
Civilization has advanced because of war, but it could easily achieve more by using a fraction of the resources wasted on warfare on peaceful research. It's just that war is one of the very few things that make imperialist nation states care enough to fund research. That's not an advantage of war, it is an indictment of these nation states.