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Ecology
11 hours ago
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The COP28 climate talks have been flooded with announcements hyping controversial carbon credits before rules for them have been hammered out, with environmental groups fearing "greenwashing" on a massive scale.
Environment
15 hours ago
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If you ever wondered what the weather might look like should global average temperatures rise 2C degrees above pre-industrial levels—the critical warming threshold the Paris Agreement seeks to prevent us from reaching—take ...
Economics & Business
16 hours ago
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Environment
Dec 3, 2023
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28
Nearly 120 nations pledged to triple the world's renewable energy within seven years at UN climate talks Saturday as the United States pushed to crank up nuclear capacity and slash methane emissions.
Environment
Dec 3, 2023
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More than 20 nations including the United States called for a tripling of nuclear energy to drive down emissions on Saturday as world leaders assembled for a second day at UN climate talks in Dubai.
Environment
Dec 2, 2023
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More than 110 countries want the COP28 climate negotiations to adopt a goal of tripling renewable energy and doubling energy efficiency by 2030, European Commission President Ursula von der Leyen said Friday.
Environment
Dec 1, 2023
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44
Headlines across the world this year focused on fires, including both wildfires and the use of military firepower, in various places.
Environment
Dec 1, 2023
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5
In 2015, more than 140 countries signed up to the goal of achieving net-zero emissions by 2050. For countries in the global south this is a huge task. On the one hand, they have committed to low emissions. On the other their ...
Earth Sciences
Nov 30, 2023
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2
The international climate change negotiations began almost three decades ago when many were still hesitant to accept that human activities were changing the planet. Now the scientific evidence is unequivocal. Climate change ...
Environment
Nov 30, 2023
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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
