The four fundamental forces come into play both in the vastness of
the cosmos and in the infinite smallness of atomic structures. Yes,
everything we see around us is involved.

Elements vital for our life (particularly carbon, oxygen, and iron)
could not exist were it not for the fine-tuning of the four forces
evident in the universe. We already mentioned one force, gravity.
Another is the electromagnetic force. If it were significantly weaker,
electrons would not be held around the nucleus of an atom. 'Would that
be serious?' some might wonder. Yes, because atoms could not combine
to form molecules. Conversely, if this force were much stronger,
electrons would be trapped on the nucleus of an atom. There could be
no chemical reactions between atoms—meaning no life. Even from this
standpoint, it is clear that our existence and life depend on the
fine-tuning of the electromagnetic force.

And consider the cosmic scale: A slight difference in the
electromagnetic force would affect the sun and thus alter the light
reaching the earth, making photosynthesis in plants difficult or
impossible. It could also rob water of its unique properties, which
are vital for life. So again, the precise tuning of the
electromagnetic force determines whether we live or not.