TOEFLリスニング

🎧 リスニング原文

Narrator: Listen to part of a lecture in an environmental science class. Professor: Today we're going to talk about a surprising solution to water scarcity in arid regions: fog harvesting. This technique involves using large mesh nets to capture water droplets from fog. As the fog passes through the net, the droplets coalesce and drip down into a collection trough. This method has been successfully implemented in places like the Atacama Desert in Chile and parts of Morocco. What's remarkable is that even in areas with very low rainfall, fog can provide a substantial amount of fresh water. However, the efficiency of fog harvesting depends on several factors, including the density and frequency of fog, the altitude of the nets, and the mesh material. For instance, a study found that nets placed at higher elevations collected more water because they were in the cloud zone more often. Also, a double-layer mesh can increase collection by up to 50%. Despite its potential, fog harvesting is not a one-size-fits-all solution. It requires specific climatic conditions, and the initial setup cost can be high. Nevertheless, for remote communities with limited access to groundwater, it offers a sustainable alternative.