Improving Organization in Carlos's Renewable Energy Article

In his article about the advancements in renewable energy, Carlos highlights several technologies that are reshaping the energy landscape. He begins by discussing solar energy, explaining its benefits, followed by an analysis of wind energy's potential. However, midway through the article, Carlos shifts focus to the challenges associated with implementing these technologies. This shift confuses the reader about the main argument. To improve the organization of his piece, which of the following changes should Carlos make?