Global coral bleaching caused by climate change demands a global response
The fourth global coral bleaching event, announced this week, is an urgent wake-up call to the world.
The fourth global coral bleaching event, announced this week, is an urgent wake-up call to the world.
Plants & Animals
Apr 17, 2024
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Fires that blaze through the wildland-urban interface (WUI) are becoming more common around the globe, a trend that is likely to continue for at least the next two decades, new research finds.
Earth Sciences
Apr 16, 2024
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54
University of Toronto (U of T) scientists have developed a framework for measuring plastic pollution emissions akin to the global standard for measuring greenhouse gas emissions. The researchers say the approach will boost ...
Environment
Apr 16, 2024
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Far more methane, a potent greenhouse gas, is being released from landfills and oil and gas operations around the world than governments realized, recent airborne and satellite surveys show. That's a problem for the climate ...
Earth Sciences
Apr 16, 2024
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Soil organic matter (SOM) decomposition is a key process that affects soil carbon storage and greenhouse gas emissions. Investigating the temperature sensitivity (Q10) of SOM decomposition and its regulating mechanisms is ...
Ecology
Apr 15, 2024
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9
Permafrost underlies about 14 million square kilometers of land in and around the Arctic. The top 3 meters contain an estimated 1 trillion metric tons of carbon and 55 billion metric tons of nitrogen. Historically, the northern ...
Earth Sciences
Apr 15, 2024
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47
A "rapid and far-reaching change" is necessary to prevent catastrophic climate change, according to the Intergovernmental Panel on Climate Change (IPCC). "However, the transformation of the economy towards climate neutrality ...
Environment
Apr 15, 2024
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86
Recent research by the University of New Mexico alumnus Melanie Kazenel and colleagues predicts climate change will reshape bee communities in the southwest United States, with some thriving and others declining. The research, ...
Plants & Animals
Apr 15, 2024
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31
Switzerland, known for pristine countryside and snow-capped peaks, is facing scrutiny of its environmental policies after becoming the first country faulted by an international court for failing to do enough against climate ...
Environment
Apr 15, 2024
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6
Temperatures in Japan's northern city of Sapporo—famous for skiing—on Monday passed 25 degrees Celsius at the earliest point of any year on record, a weather agency official said.
Environment
Apr 15, 2024
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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