A new study published today in Nature Sustainability has found that using hydropower dams to generate low emission energy can cause problems for other economic sectors such as food production unless smart designs are employed.
Environment
Jan 27, 2023
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43
Geologists are interested in the sedimentary cycle—erosion from mountains that forms sand that is carried out to the ocean—because it's foundational for understanding how the planet works.
Earth Sciences
21 hours ago
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55
A decrease in tropical forest biomass stemming from changes in climate may lead to increased carbon emissions that could accelerate global warming, according to a new study co-authored by YSE postdoctoral associate Maria ...
Ecology
Feb 7, 2023
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71
A collaboration including scientists from Lawrence Livermore National Laboratory (LLNL), Sandia National Laboratories, the Indian Institute of Technology Gandhinagar and Lawrence Berkeley National Laboratory has created 3-4 ...
Nanomaterials
Feb 7, 2023
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71
Alley cropping is the agricultural practice of planting rows, or alleys, of trees in fields of crops. According to a new study by an international, multidisciplinary research team led by the University of Göttingen, this ...
Ecology
Feb 7, 2023
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76
UC Riverside researchers have identified tiny organisms that not only survive but thrive during the first year after a wildfire. The findings could help bring land back to life after fires that are increasing in both size ...
Ecology
Feb 7, 2023
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107
China's stricter clean heating policies have improved air quality in northern China, particularly in Beijing and surrounding cities—potentially reducing premature deaths due to air pollution in 2021 by more than 23,000 ...
Environment
Feb 1, 2023
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64
New UC Riverside research suggests nitrogen released by gas-powered machines causes dry soil to let go of carbon and release it back into the atmosphere, where it can contribute to climate change.
Environment
Feb 1, 2023
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126
Global warming is an increasingly worrying problem. Although the greenhouse effect is a necessary process to maintain living conditions on Earth, our current societies are increasing the emission of greenhouse gases into ...
Materials Science
Jan 31, 2023
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120
European Union (EU) consumers are "exporting" negative environmental impacts to their Eastern European neighbors, while keeping the bulk of economic benefits linked to consuming goods and services, a new study reveals.
Environment
Jan 26, 2023
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23
A greenhouse (also called a glasshouse) is a building in which plants are grown. These structures range in size from small sheds to very large buildings. A miniature greenhouse is known as a cold frame.
A greenhouse is a structure with different types of covering materials, such as a glass or plastic roof and frequently glass or plastic walls; it heats up because incoming visible solar radiation (for which the glass is transparent) from the sun is absorbed by plants, soil, and other things inside the building. Air warmed by the heat from hot interior surfaces is retained in the building by the roof and wall. In addition, the warmed structures and plants inside the greenhouse re-radiate some of their thermal energy in the infra-red, to which glass is partly opaque, so some of this energy is also trapped inside the glasshouse. However, this latter process is a minor player compared with the former (convective) process. Thus, the primary heating mechanism of a greenhouse is convection. This can be demonstrated by opening a small window near the roof of a greenhouse: the temperature drops considerably. This principle is the basis of the autovent automatic cooling system. Thus, the glass used for a greenhouse works as a barrier to air flow, and its effect is to trap energy within the greenhouse. The air that is warmed near the ground is prevented from rising indefinitely and flowing away.
Although there is some heat loss due to thermal conduction through the glass and other building materials, there is a net increase in energy (and therefore temperature) inside the greenhouse.
Greenhouses can be divided into glass greenhouses and plastic greenhouses. Plastics mostly used are PEfilm and multiwall sheet in PC or PMMA. Commercial glass greenhouses are often high tech production facilities for vegetables or flowers. The glass greenhouses are filled with equipment like screening installations, heating, cooling, lighting and may be automatically controlled by a computer.
This text uses material from Wikipedia, licensed under CC BY-SA
