The document provides instructions for an assignment on issues related to energy changes. Students are asked to write an opinion paper on the issue after reviewing peers' posts and teacher feedback. The paper must thoroughly research and reflect on the issue, include all relevant information and data, and be written in an appropriate scientific style with reliable sources cited using the appropriate referencing style. The document also introduces deep lake water cooling as a new technology that uses large bodies of cold water as a heat sink. It describes how the process works and provides an example of how it could be implemented in Toronto to cool large downtown buildings.