People who display a/an attitude "see the glass as half full" and reinforce a
positive, supportive environment at work.

Optimistic.

Explanation:

People who display an optimistic attitude "see the glass as half full" and reinforce a positive, supportive environment at work.

This ultimately implies that, an optimistic individual or employee is one who is always positive in his or her thinking, emotion and feelings. Therefore, rather than see challenges as an obstacle or a hindrance, they see it as an opportunity to exercise their skills, ability, experience, knowledge and technical know-how.

Hence, rather than see a cup has half-empty it is seen

the plates spread at mid-ocean ridges (they are divergent plate boundaries) which allows magma to rise through the weakness between the plates. the magma then emerges as lava from the boundary and cools, creating a new crust.