New windows can cause fires. Some homeowners installed special windows to save energy. These are called "low-E" windows. They have a thin metal layer on the glass. This layer reflects heat to keep houses warm in winter and cool in summer. This technology is good for the environment because it uses less energy.
However, there is a dangerous problem. Sometimes, the glass is not perfectly flat. If the glass is slightly curved, it acts like a magnifying glass. It takes the sunlight and focuses it into one small, hot spot. This is very dangerous for the area around the house.
The concentrated sunlight can burn wooden decks and melt artificial grass. It can also kill plants. In some cases, the heat is so strong that it starts a fire. This happened recently with a homeowner's new windows. The concentrated light was the cause of the fires.
This problem can also happen with very large buildings. Some tall skyscrapers can create intense beams of light. These beams can be a threat to the city around them. Experts call these "death rays" because they are so powerful.
Architects must be careful when they design buildings. They need to make sure the glass is flat and installed correctly. If the glass is flat, it will not focus the light. Using this green technology is important for the future, but we must use it safely to prevent fires.