Dispose waste

Waste disposal halves the ground pollution. In strong polluted areas you cannot built anything and already placed buildings loose health and productivity.

Advancements

Each building can be enhanced with ecologic and efficiency advancements. The former improve the environmental performance of the building, which means they reduce the caused air and ground pollutin. The second increase production and output, but often this is associated with higher energy and maintenance costs.

Repair building

A highly damaged building produces less resources and in the worst case explosions can damage nearby buildings. Repair it!

Disable production

Disabling a building stops the production. This is helpfull if you are short in money or energy.

Destruct building

Destruct the building to free the ground for a forest or other less polluting buildings.
You should also destruct ruins, because they keep spreading pollution.

Upgrade City

You can upgrade a City Center to increase it’s maximum population to 250.000 oder 500.000. Furthermore the building radius arround it will become larger. A City District keeps 100.000 people and can be upgraded to 250.000.

Cutting down forests

Cut down forests to earn extra money – a good plan if you are short of it! One thing you have to consider is that forests also compensate global air pollution as well as local ground pollution. You can stop uprooting to allow the forests to regrow; a complete reforestation will be expansive.