Colorado is becoming ground zero in an environmentalist push to use state ballot initiatives to ban fracking, which is expected to encourage the tactic in other parts of the country.

The push follows a decision by the state’s Supreme Court last week that ruled against two towns imposing their own local bans on the drilling practice. Environmentalists say the court decision won’t stop the push to keep fossil fuels in the ground as part of a climate change agenda. Some conservative groups tend to agree.