Example 1
Prompt: A 75-second lecture on urban heat islands: cities are warmer than surrounding areas because concrete and asphalt absorb heat, there are fewer trees, and vehicles and air conditioners release waste heat. Green roofs have lowered rooftop temperatures in some cities, and the speaker argues that planting street trees is the cheapest response.
The lecture was about urban heat islands, which means cities are often warmer than the areas around them. The speaker explained three main causes. First, materials like concrete and asphalt absorb heat during the day and release it at night. Second, cities have fewer trees to provide shade. In addition, vehicles and air conditioners produce waste heat. The speaker mentioned that green roofs have reduced rooftop temperatures in some cities. Overall, the speaker concluded that planting street trees is the cheapest way to reduce the problem.
Why it works: It covers the topic, all three causes, one example and the conclusion, using simple linking words. At about 90 words it fits the 40-second response time.
