Shadowzone by Simon Rose

Young adult science fiction fantasy

While watching intense flashes of lightning during a violent storm, Ben experiences mysterious and disturbing visions of another world, one very different from his own. In the chain of events that follow, Ben encounters Charlie, a girl from a dark version of Earth, a planet doomed by the effects of environmental catastrophe, where the leaders will stop at nothing to complete their deadly mission.

https://www.amazon.com/Shadowzone-Simon-Rose-ebook/dp/B074BCM1L9