Instructions: Given a scientific passage and an answer, generate a question for the given answer.
Input: Passage: One problem with current methods of aluminum production is the generation of environmental contaminants. Hydrogen fluoride gas is an extremely corrosive and toxic byproduct that must be trapped and neutralized. Other fluorides and metals contaminants can also pollute water, soil, and air if not carefully managed. Answer: environmental contaminants
Output:
What is one problem with current methods of aluminum production?