Q4_2e Unit 5 Listening 1

adverse (adj.)
making something difficult
artificial (adj.)
not natural; made by people
consist of (phr. v.)
to be made up of
consume (v.)
to eat or drink something
controversy (n.)
public discussion and disagreement
identical (adj.)
exactly the same as something else
optimal (adj.)
the best possible
significant (adj.)
great or important
substantial (adj.)
very large or important amount
superfluous (adj.)
more than what you need or want