Which best explains why scientific ideas lack scientific consensus?

They are already laws.

They are new ideas.

They are not accepted by the public.

They are not published in an encyclopedia.

Scientific ideas don't need to be published in an encyclopedia: rather, they need to be published in a peer-reviewed journal.

Also, public acceptance is not relevant: global warming is accepted in the scientific community despite a lack of popular acceptance.

The correct answer is: They are new ideas. (and once they're accepted they can become laws).