Read the excerpt from paragraph 13.

[13] "With the immediate carbon emission reduction benefit from replacing fossil-based non-renewable concrete and steel with renewable mass timber products, the urgent climate change crisis can be mitigated now to help save our future."

Which main idea does Hongmei Gu's point help to develop?

A.
There needs to be more research on how to produce renewable mass timber products.
B.
Sustainable changes that we make now will have a positive impact on our future.
C.
It is imperative that we stop using fossil-based non-renewable concrete right away.
D.
Concrete should no longer be made with cement because it emits greenhouse gases.