NASA is canceling a planned satellite that was going to intensely monitor greenhouse gases over the Americas because it got too costly and complicated.
Space Exploration
2 hours ago
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6
Climate change can manifest in different ways: stronger tropical droughts, extreme droughts, warmer climates and highly unpredictable rainfall patterns. All these endanger the availability of food, which in turn could increase ...
Environment
14 hours ago
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The world is under growing pressure to find sustainable options to cut emissions or lessen the impacts of climate change.
Environment
16 hours ago
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17
Environmental disaster struck the shores of Peru on Jan. 15, 2022, when Spanish energy company Repsol spilled 12,000 barrels of crude oil into the Bay of Lima after its tanker ruptured. The spill endangered 180,000 birds ...
Environment
17 hours ago
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5
The United Nations has identified improving the walkability and bikeability of cities as a key goal in efforts to reduce dependence on greenhouse gas–emitting automobiles and promote routine exercise for public health. ...
Environment
17 hours ago
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They are the salt-tolerant shrubs that thrive in the toughest of conditions, but according to new UniSA research, mangroves are also avid coastal protectors, capable of surviving in heavy metal contaminated environments.
Ecology
Nov 29, 2022
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A group of children and young adults including Greta Thunberg have filed a class-action lawsuit against the Swedish state for failing to take adequate measures to stop climate change.
Environment
Nov 28, 2022
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22
With the help of mirrors, placed only a few hundred nanometers apart, a research team has managed to use light more efficiently. The finding could eventually be useful for controlling solar energy conversion during photosynthesis, ...
Optics & Photonics
Nov 28, 2022
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21
The number of lakes on our planet has increased substantially in recent decades, according to a unique global survey of 3.4 million lakes that the University of Copenhagen has taken part in. There has been a particular increase ...
Earth Sciences
Nov 28, 2022
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Changing what we farm, and where, could provide all New Zealanders with a healthy diet with benefits to our water, climate, and the national economy, finds new research from two National Science Challenges.
Earth Sciences
Nov 25, 2022
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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
