Why does the Catholic Church forbid wedding ceremonies outdoors?

God created nature. Jesus preached on hillsides. Why can a Catholic Priest not perform the marriage ceremony in an outdoor setting?

The following links should assist you in better understanding the Catholic Church’s rules on outdoor weddings. If you have any further questions or concerns that are not answered by these links, please contact Catholic Answers directly.
Recommended Reading:
[LIST]
*]Can a Catholic wedding be performed outside of the church building?
*]What about an outdoor wedding?
*]Can a Catholic wedding take place in a garden?
*]Can a priest perform a wedding ceremony outdoors?
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