Council of Elrond

A simple question. What is the definition of "environment card" as mentioned on Twilight? I searched the Universal Rules Document for "environment" with no success.

Is Rank upon Rank part of the definition?

Thanks

If a card has the Environment keyword, it is an environment card. Otherwise, it is not.

Doors of Night has the environment keyword.

Rank Upon Rank does not.

Thanks again for your help Master Took!

If only it were all so simple