Question 1
Read the given passage and answer the questions that follow.
On a summer afternoon, a person walking from a leafy residential colony into a crowded commercial market often feels the air grow noticeably hotter within a few hundred metres. This is not imagination. Scientists call the phenomenon the urban heat island. Built-up areas tend to remain warmer than the surrounding countryside, and the difference is usually most pronounced after sunset.
The causes are largely of our own making. Concrete, asphalt and brick absorb sunlight during the day and release the stored heat slowly through the night, so the city never quite cools down. Trees and open soil cool the air by releasing water vapour, but they are replaced by roads and rooftops. Air conditioners, vehicles and factories add their own waste heat. Tall buildings packed closely together trap warm air and block breezes.
The consequences go beyond discomfort. Warmer nights deny the human body its chance to recover from daytime heat. This is why the elderly, outdoor workers and people living in poorly ventilated homes are especially vulnerable. Higher temperatures also push up demand for electricity, and the extra power used for cooling often comes from burning fuel, which in turn adds to the warming. In this way the problem feeds on itself.
Yet the heat island is not an inevitable price of urban growth. Some Indian cities have begun painting rooftops white so that they reflect sunlight instead of absorbing it. This simple measure can lower indoor temperatures in small houses with tin or concrete roofs. Planting trees along streets, protecting lakes and wetlands, and designing buildings that allow air to flow freely can all help. None of these steps is dramatic on its own. Together, however, they suggest that a city can be planned to stay cooler, provided planners treat heat as seriously as they treat traffic or water supply.
Which of the following is the most suitable title for the passage?



