Researchers are studying the variation of heatwave projections across different areas, including US cities. The focus of these studies includes understanding how heatwaves have changed over time and their impact on vulnerable communities. The scope of the research appears to be broad, with some studies examining heatwaves in specific regions, such as the western US and Peninsular Malaysia, while others look at the issue more generally, including trends and disparities in heatwave frequency and economic losses.