In 2023, Johnson published a comprehensive study focusing on the impact of climate change on urban environments. The research highlighted how rising temperatures and extreme weather events are affecting city infrastructure, public health, and local economies. The study utilized data from various cities worldwide, including New York, Tokyo, and London, to analyze trends and propose sustainable solutions. Johnson emphasized the importance of adaptive strategies, such as green spaces and improved public transportation, to mitigate the adverse effects of climate change in urban areas.