In this task, we ask you to elaborate the sentence without changing its general meaning. You can do so by explaining further the input sentence, using more precise wording, adding qualifiers and auxiliary information etc.

The Stockholm Convention which took effect in 2004 , restricts the use of DDT to vector control .
The Stockholm Convention on Persistent Organic Pollutants , which took effect in 2004 , put a global ban on several persistent organic pollutants , and restricted DDT use to vector control .