Seriously, I hate seeing christmas trees dumped on the sidewalk. That is so disrespectful to the neighborhood. I saw it already tonight. Not put in a bag or anything. Just dumped on the sidewalk in front of an apartment building. Of course, it's only apartment dwellers who behave this way.
How much effort does it take to put the tree in a large garbage bag and put in the dumpster. Taking it to a tree recycling place is preferable but I know that's too much to ask.
At least the city has the furniture dumping problem under control. Now it's ok to take your furniture to the sidewalk and dump it. Some good samaritan will call pickup for you! Most likely a nearby homeowner.