Walsall's target of becoming a carbon-neutral town has been pushed back 20 years, to 2050.
The Labour group on Walsall Council had asked for a "climate emergency" target of getting there by 2030, but the ruling Conservative group managed to get that amended.
The Conservative council leader, Mike Bird, said he wanted to ensure there was an achievable plan in place.
Earlier this year, the West Midlands Combined Authority called for the region to have net-zero emissions "no later than 2041".
The UK as a whole is targeting net-zero emissions by 2050.