Reuven and Shim'on are neighbors. They haven't discussed this matter, and Shim'on isn't available to consult. When Reuven is shoveling snow off of his walk, may he throw it onto Shim'on's lawn? Assume that this creates no apparent additional hazard or hardship for Shim'on, as snow on a lawn usually wouldn't. I'm wondering whether, from a property-rights perspective, Reuven may use Shim'on's property thus without permission, or whether it would be considered stealing.
Similarly, suppose Reuven wants to throw his snow into the public street, and again assume that it creates no apparent additional hazard or hardship, since the additional snow is diffuse enough in the street to not make a difference. May Reuven do this?