The European Parliament has called for an EU treaty change to stop MEPs' monthly shuttle to Strasbourg in France, and instead make Brussels the parliament's permanent home.
Most MEPs are convinced that the Brussels-Strasbourg shuttle is a huge waste of time and money.
The costs and CO2 emissions have grown as the parliament has got bigger and more powerful over the years, they say.
Unanimity is required for a treaty change, so France can still block it.
Only EU governments—jointly called the Council—currently have the power to change a treaty.