GCSE Bitesize: Heat transfer by radiation. Mygcsescience - infrared radiation. Discovery of infrared. Greenhouse effect. Sunlight (infrared) melting rock. The Electromagnetic Spectrum: Infra red. Surfaces and radiation. Climate Kids: What is the greenhouse effect? 1. What is a greenhouse? A greenhouse is made of glass. It traps the Sun's energy inside and keeps the plants warm, even in winter. A greenhouse is a house made of glass.