Is there an act of god defense? He says I was negligent.
The car was uninsured ie liability only so there is no insurance involved.
Speeding / Traffic Ticket Lawyer
There are many issues involved here i.e. whether the tree was a hazard and whether you knew that it was or whether it was an Act of God as you say - he also parked under a tree during a storm which may be contributory negligence - but I would also advise you to contact your insurance carrier and see what they say.