How can we overcome the barriers that impede progress toward a more sustainable renewable energy economy?

some of the barriers impeding the progress  of attaining a more sustainable renewable energy economy include

Explanation:

There must be structure on ground which will facilitate the work on renewable energy provision for the people, also there must be a political will on the part of the Government to accelerate the growth of renewable energy and lastly the perception of the people has to be changed toward accepting the best form of produce power through renewable energy rather than  through fossil fuel

1. a)c-14 has two more protons

2. d)they have different numbers of protons, neutrons, and valence electrons; they are all gases at room temperature.

3. c) iron and nickel.