Question

What is the noun clause in the sentence: "My great dream is that people will truly love one another."?

Answer 1

"That people will truly love one another."

Explanation:

Noun clauses are introduced by words such as that (as it is in this case), when, what, how, where, whatever, which, whether, whoever, whom, etc.

Noun clauses include a subject (people) and a verb (will love).
All of the words act together as a noun.

A helpful site with lots of examples:
http://www.k12reader.com/term/noun-clause/