Incinerating Zombies

The zombies behind the wall were piled two to three meters high already. Seeing as the opportunity was right, the survivors brought the fuel cylinders up to the wall and began to pour it onto the zombies. Then the survivors tossed down torches.

The fuel wasn't gasoline but an organic fuel similar to an alcohol mixture. It is worth mentioning that most of the vehicles in the 22nd century used high-capacity batteries, not fossil fuels. Because of this, all of Wanghai City barely had any fuel stations; what replaced them were charging stations.

Controllable fusion made electricity extremely cheap in the 22nd century. Power was produced from the fusion power stations located on the moon then transported through wireless technology to relaying satellites before reaching the earth's surface. Fossil fuels naturally, were replaced.