Walls and fences designed to secure national borders could make it difficult for almost 700 mammal species to adapt to climate change, according to new research.
Ecology
Feb 08, 2021
5
111
Scientists have resolved a key climate change mystery, showing that the annual global temperature today is the warmest of the past 10,000 years—contrary to recent research, according to a Rutgers-led study in the journal ...
Earth Sciences
Jan 27, 2021
36
2196
Projections of rising sea levels this century are on the money when tested against satellite and tide-gauge observations, scientists find.
Environment
Feb 15, 2021
134
875
Rivers and lakes at high latitudes are considered to be major sources for greenhouse gas emissions to the atmosphere, but these losses are poorly constrained. In a study published in Nature Communications, Umeå University ...
Earth Sciences
Feb 09, 2021
0
96
Fossil fuel pollution caused more than eight million premature deaths in 2018, accounting for nearly 20 percent of adult mortality worldwide, researchers reported Tuesday.
Environment
Feb 09, 2021
8
467
It's clear that rising greenhouse gas emissions are the main driver of global warming. But on a regional level, several other factors are at play. That's especially true in the Arctic—a massive oceanic region around the ...
Environment
Feb 08, 2021
1
47
The findings are published in the prestigious journal, Nature Climate Change, and calls on businesses, the financial services industry and regulators to work more closely with climate scientists.
Environment
Feb 08, 2021
0
23
Global greenhouse gas emissions over the last century have made southern China a hotspot for bat-borne coronaviruses, by driving growth of forest habitat favoured by bats.
Ecology
Feb 05, 2021
18
861
As the planet warms, glaciers are retreating and causing changes in the world's mountain water systems. For the first time, scientists at the University of Oxford and the University of Washington have directly linked human-induced ...
Earth Sciences
Feb 04, 2021
20
52
The lockdowns and reduced societal activity related to the COVID-19 pandemic affected emissions of pollutants in ways that slightly warmed the planet for several months last year, according to new research led by the National ...
Environment
Feb 02, 2021
13
928
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
