My wife's greatest fear is environmental change, where loggers, evil corporations and cities have taken over the world and there are no more trees and greenery.

There are 2 sides, the Hippies and the Loggers, each fighting to own a piece of land. The Hippies want to plant trees and the Loggers want to cut them down and build cities. Each side gets a selection of units to send out into the field: you have Bulldozers, which are very slow but have immense pushing power, Hippy Vans which are fast and agile but not as powerful, and Hippies & Lumberjacks which are the generic ground troops and are cheap to produce. Units that reach the other side wins some land for your side but you will need to defend it from incoming units as well. The result is a fast paced twitchy game with subtle strategy using a tug of war mechanic. You're constantly sending out your troops to push the other side back and hopefully get some of your units to the other side as well.