Green PakistanWala

HOW DOES A GREENHOUSE WORK The greenhouse , also known as the glass house, is a building designed to protect against tender or off-season plants against extreme cold or heat. In the past, greenhouses were modest bricks or wooden shelters with little source of light and some sources of heat. As glass became cheaper and more refined forms of heating became available, the greenhouse was transformed into a ceiling-and-walled structure made of minimal wood or metal skeletons. By the middle of the nineteenth century, the greenhouse had evolved from a mere shelter to a hostile environment, tailored to the needs of particular plants. The large-scale increase in the availability of exotic plants in the 19th century resulted in a large increase in the culture of glasshouses in England and elsewhere. Large greenhouses are important for agriculture and horticulture and botanical sciences, while small structures are commonly used by hobbyists, collectors and domestic gardeners

What is global warming and its causes What is global warming? Global warming means rise in temperature. Yes, it is a worrying situation that this temperature has risen to record levels in the last 50 years, and this increase is constantly happening. The last 16 years have been the hottest years in NASA's 134-year history.Those denying climate change have suggested that global warming has slowed down, but recent research has rejected that stand,and research has shown that global temperature will rise by 10 degrees over the next hundred years. Causes of global warming. When carbon dioxide CO2 gas and other pollutants are emitted from various pollutant sources, they continue to accumulate in the Earth's atmosphere and the ozone layer absorbs the sun's dangerous rays,seek damages. Greenhouse gases, together with them, raise the temperature of the earth, causing global warming. Global warming and extreme weather.