From Wookieepedia:
...Meteorologically, the planet's weather patterns were affected by the troposphere-piercing buildings that covered the planet's surface...
...Thousands of years of urban development destroyed the planet's ancient mountains and seas. As such, Monument Plaza housed the top of Coruscant's last remaining mountain peak...
...citizens who lived in the upper levels were able to breathe air that was filtered and clean, while lower-class inhabitants were forced to breathe the air of toxic fumes from factory and vehicular waste. As such, most visitors to Coruscant chose to bring their own air supply to last the length of their stay...
With all these negative side-effects stemming from building an ecumenopolis, along with having to have all their food shipped in and having that "clean" air be cleaned artificially, I would assume that at some point someone would be against any further development and destruction of the planet. While not much is known of Coruscant's original ecosystem, there was enough that the planet's current state is vastly different from the original (ie not a desolate desert).
Obviously if they tried, they failed, but has anyone ever attempted to save Coruscant's natural elements?