WIFI radiation kills trees and plants. It also effect humans and there is a lot of reacher that support these claims.
WIFI has a similar single to DECT, Cellphone and other wireless communications technologies.
There are pliantly of research and studies about the health risk or exposure to RF EMR both on plans and humans. The industry try to old the info back so we will all continue to use and consume wireless products and services.
Bellow is a clip I saw a week ago about the effect of wireless communication from electricity meters in: