The knowledge of good created in man gives man the capacity to work in the creative power of God when harnessed well. Humans are created in God's likeness, we have the mind of Christ, and we can do extraordinary things on earth.
When you read Genesis 1 through 2, you realize that this is talking about God placing humans in Eden to take charge, become fruitful, multiply, and have dominion. Fruitfulness, multiplication, and filling the earth speak about reproduction, and creatively expanding goodness across the earth with skill and craft, trade, and also the multiplication of families.