Why old-school climate denial has had its day

The Coalition has been re-elected to government, and after six years in office it has not created any effective policies for reducing greenhouse emissions. Does that mean the Australian climate change debate is stuck in 2013? ...

Britain to intensify fight against climate change

Britain's outgoing prime minister on Wednesday announced plans to eliminate the country's net contribution to climate change by 2050 as Europe's effort to slow global warming picked up speed.

Big brands breaking pledge to not destroy forests: report

A rainforest area the size of Spain will be destroyed by firms growing consumer staples like palm oil in the decade to 2020, industry's self-imposed deadline to end deforestation, Greenpeace said Tuesday.

One change can make diet more planet friendly

Food production is an important contributor to climate change, accounting for about a quarter of carbon emissions globally. According to a study that examined the real-world diets of thousands of people in the U.S., we could ...

GE lost billions by 'misjudging' renewables: report

Investors in General Electric, once one of the world's most valuable companies, lost tens of billions of dollars after the Paris climate deal as it failed to adapt to the pace of the green energy transition, new analysis ...

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Greenhouse

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