Temperatures have soared in the Southern California city of Long Beach in recent years, and the average temperatures are expected to keep increasing. This heating trend is partially due to global warming, and partially due to the city’s urban heat islands, which tend to have a lot of cement and fewer parks or trees—and are often concentrated in low-income communities. That’s why the city has a plan to create more parks and plant 10,000 trees in low-income areas of town to combat the heat. One study at a local elementary school showed that adding trees could reduce temperatures by as much as 3 degrees.