Report on successful blockade and tree-sit in so-called southern Oregon that stopped the logging of old-growth forest. For more background on the campaign, go here. The Bureau of Land Management (BLM) was pressured by activists to remove an area with ancient trees that was set to be logged as part of the Poor Windy project....
This is similar to a technique known as spiking, and it has been used but I believe most activists have moved away from it because can be dangerous to loggers who may not be aware of the metal inside.
That said, these trees are massive so rebar probably isn’t strong enough to keep them upright. It just makes it more difficult and dangerous to cut them.