Invention and Engineering
Environmental technology (or envirotech) is the application of one or more of environmental science, green chemistry, environmental monitoring and electronic devices to monitor, model and conserve the natural environment and resources, and to curb the negative impacts of human involvement. The term is sometimes also used to describe sustainable energy generation technologies such as photovoltaics, wind turbines, etc.
British Rail Class 88.
Durango and Silverton Narrow Gauge Railroad.
Text from Wikipedia; plate via Wikimedia Commons. Text CC BY-SA 4.0; plate freely licensed (see Commons). Source record. Images and catalogue data are reproduced from open-access collections.