Read the excerpt from a report. (1) Cleaning up the existing garbage in the ocean would begin to address the issue of climate change. (2) A company called the Ocean Cleanup Project has successfully developed a self-contained system that collects ocean garbage. (3) It uses the natural forces of the ocean to dump floating plastic. (4) The system consists of a thing, which holds a ten-foot screen below and catches the waste. (5) It would be awesome to have a bunch of these systems removing garbage.

Which revision improves the precision of the text?

In sentence 1, change “address” to “impact.”
In sentence 2, change “self-contained” to “one-of-a-kind.”
In sentence 3, change “ocean” to “sea.”
In sentence 4, change “thing” to “barrier.”