Facts about climate change

What is climate change? Weather changes day to day—sometimes it rains, other days it’s hot. Climate is the pattern of the weather conditions over a long period of time for a large area. And climate can be affected by Earth’s atmosphere. Our Earth is surrounded by an atmosphere made up of gases. When sunlight enters our atmosphere, some of the sun’s heat is trapped by the gas, and some bounces back out into space. By trapping that heat, our atmosphere keeps Earth warm enough to live on. Without it, our planet would be very cold, like Mars. Earth’s climate has always naturally cycled through change, caused by Συνεχίστε την ανάγνωση →

The greenhouse effect

The «greenhouse effect» is the warming that happens when certain gases in Earth’s atmosphere trap heat. These gases let in light but keep heat from escaping, like the glass walls of a greenhouse, hence the name.Sunlight shines onto the Earth’s surface, where the energy is absorbed and then radiate back into the atmosphere as heat. In the atmosphere, greenhouse gas molecules trap some of the heat, and the rest escapes into space. The more greenhouse gases concentrate in the atmosphere, the more heat gets locked up in the molecules. Scientists have known about the greenhouse effect since 1824, when Joseph Fourier calculated that Συνεχίστε την ανάγνωση →