Sid Meier's Alpha Centauri/Diplomacy

The Planetary Council
The Planetary Council is a unique feature among Civ games; so far, no other game has an equivalent. The Planetary Council consists of every human faction in the game (not counting those who have been eliminated or committed major atrocities). When a player has the commlink factions of all the other human factions, that player may convene the Planetary Council. (When this happens, all the human factions will have each others' comm links.)

The first proposal the Council must consider is electing the Planetary Governor. Only the two factions with the most votes can be eligible. It is advantageous to be the Governor, therefore in some cases it may be best to wait before convening the Council if you haven't enough votes now but have a shot at eligibility within the next few turns.

Proposals
The primary purpose of the Council is to consider various issues which may arise, such as electing a Planetary Governor.

Elect Planetary Governor

 * Prerequisite: N/A

The Planetary Governor can introduce new proposals more often and enjoys automatic infiltration of all factions. That means if the Governor isn't you, it should be somebody you trust.

Global Trade Pact

 * Prerequisite: Planetary Economics

Commerce rates are doubled for all factions.

Increase Solar Shade
See Launch Solar Shade

Launch Solar Shade

 * Prerequisite: Advanced Spaceflight

Causes global cooling and the sea levels to drop. If a solar shade has already been launched, this proposal will be called "Increase Solar Shade".

Repeal Global Trade Pact

 * Prerequisite: Planetary Economics

Commerce rates are halved for all factions.