Will this deter a cat from climbing a Christmas tree?

No, cats love Christmas trees, and this is not a deterrent. All it does is make your Christmas tree smell like a orange tree.

What are the ingredients? They don't seem to be listed anywhere-even the Angry Orange website.

They aren't listed because you can make this on your own with orange oil, boiled water, and baking soda.

Is it safe to use on wood floors?

You should've treated the carpet with a natural enzyme pet stain and odor remover FIRST. I used to think cleaning my cats urine off of my beautiful hardwood floors with a strong bleach and water solution was enough to do the trick...but theyd still come back and pee in the same spots again. Until I learned about using Natural, enzyme, pet stain & odor removal sprays. Unlike Bleach (temporary pee odor relief), I learned these Natural enzyme sprays are designed to TOTALLY Eliminate the odor. If either of the 2 cats pee on the floor again...it will NOT be in that same spot/location. FACT! As for this orange product, you determine the strength of it depending on ratio water/solution. You probably made the solution too weak! Some of this orange stuff got on my fingers during mixing, I went over to one of my nosey cats...she almost hurt herself running away from my fingers! 😳😳😳 Not sure about dogs...but after peeling an orange one day last week, I let my cat (laying beside me at the time) smell my citris ridden fingers thinking she'd love the heavy orange smell as much as I do...TO MY SURPRISE she jumped up & back...I was like "What the...?" she looked at me like "Wtf you do that for? I'm outta here you evil b***h!" & she jumped off the bed and literally ran away! I smelled my fingers again, because the wonderful delicious smell of ORANGES, it smells so good! But not to a cat! Thats when I decided to buy this stuff.