In what sense are people rulers over creation?

As most of you can tell Ive just started rereading the book of Psalm - What a great book!!

Psalm 8:6
In what sense are people rulers over creation?

At creation, God set humankind above all other species to rule and subdue the earth (Genesis 1:28). Conceivably, reason, intel­ligence, and self-consciousness could have been given to fish or birds, but, in fact, the gift and responsibility settled on humans, by God's design and will.

People, therefore, do not rule over creation as final authorities. Rather, people are stewards over God's creation. A good manager cares for the property of his employer and is compensated according to the growth of assets in his domain (Matthew 24:46). Whether your vocation is law, plumbing, education, forestry, or ministry, God is pleased when your circle of responsibility is well managed—that is, handled with integrity, virtue, and vision.