While you can burn most woods, I would pass on the arborvitae. As an evergreen, you will get a LOT of creosote, fast burning, short lasting fires. It also contains a toxin believed to be a hallucinogen. A small amount used as kindling may not be a problem.
why would anybody want to burn trees in a fireplace and yes they can burn.
No. Fireplaces only allow normal logs to be burned; all other logs cannot burn in a fireplace of player-owned houses or any other house's fireplace in RuneScape for that matter.
The odor would be disagreeable.
yes, the oils in the wood make it burn very quickly, the wood will not last long, and you should be sure to clean your chimney regularly, but the wood burns quite well
no
Yes it can
Check with Martin for an owner's manual. Unless a fireplace is specifically rated as multi-fuel, a gas fireplace cannot safely burn wood.
No, it is not safe to burn. It is toxic.
yes you can burn cactuse
You really should not burn ANY solid fuel in a gas fireplace.
I do.
Yes
Yes.
Yes. Not really great as firewood, but you can burn it.
quite good to burn indeed!