to mess with an opponents thing. I.e. I am in a science fair and i go unplug my opponent's science project. that is sabotage
When talking about recycling, people don't seem to consider the recycling of clothing.
The comma should be placed between the first use of recycling and people. The subordinate clause is "when talking about recycling". This is a clause because of the word "when". When makes the reader wonder when what? The main clause is "people don't seem to consider the recycling of clothing."
Visualize bc the pictures help to view the perspective using you eye balls