The latest research shows that if the reflection capacity of urban roofs and road surfaces is increased, the temperature of the earth's atmosphere may be reduced at a very low cost. Although the reduction is small, it can be measured. Some researchers said in the Environmental Research Report Because roofs and roads account for more than 60% of the city's surface area, the use of light-colored materials can increase the average reflectance to a certain extent, reducing the average global temperature by as much as 0.07 degrees Celsius. Based on this text, which of the following understanding is correct? ['New materials can significantly reduce the indoor temperature.', 'Urban pavement accounts for more than half of the total urban area.', 'People are exploring new ways to alleviate global warming.', 'Strong reflective ability on the surface of dark materials.']