The living place or "home" of a particular organism or biological community.Search the Web for Habitat
In return, the landowner is permitted to sell credits to national or international companies or developers, enabling them to satisfy legal requirements compensating for the environmental impacts of their development projects in the region or elsewhere.
Although big in the US, where there is a $3bn market, habitat banking's global reach is nowhere near the size of carbon offsets.
Potential for schemes is particularly high in Central and South America, although concerns remain over monitoring and proving how effective projects really are.Search the Web for Habitat Banking
A dust or sandstorm that forms as cold downdraft's from a thunderstorm turbulently lift dust and sand into the air.Search the Web for Haboob
Combined land sea temperature database from the (UK) Hadley Climate Research Center.Search the Web for HADcrut
Halogen bulbs are a form of energy efficient lighting that use around 25 per cent less energy than traditional incandescent bulbs.
Like traditional bulbs, Halogen bulbs use a tungsten filament, but they use a halogen gas inside the bulb rather than argon or nitrogen, making the filament last longer.
Around half the size of traditional bulbs, they are most commonly used in fixed ceiling down-lighters.
It is expected that some lower-efficiency Halogen bulbs will be banned alongside incandescent bulbs under upcoming EU regulations, though the sale of higher efficiency models will still be permitted.Search the Web for Halogen Bulbs
Byproducts of society with physical, chemical or infectious characteristics that pose hazards to the environment and human health when improperly handled.Search the Web for Hazardous Waste
Distant lightning that illuminates the sky but is too far away for its thunder to be heard.Search the Web for Heat Lightning
A heat pump is an electrically powered mechanical device that takes heat from one location and transfers it to another location. An air conditioner is an example of a heat pump in that it takes heat out of the interior space and then rejects that heat to the outdoors. However, a true heat pump can work in either direction, unlike an air conditioner; in that it can take heat out of an interior space, or it can put heat into an interior space.Search the Web for Heat Pump
Manufacturing activities engaged in the conversion of large volumes of raw materials and partially processed materials into products of higher value; hallmarks of this form of industry are considerable capital investment in large machinery, heavy energy consumption, and final products of relatively low value per unit weight (see Light Industry).Search the Web for Heavy Industry
The main uses of hemp fiber are rope, sacking, carpet, nets and webbing. Hemp is also being used in increasing quantities in paper manufacturing. The cellulose content is about 70%.Search the Web for Hemp
A chemical pesticide designed to control or destroy plants, weeds, or grasses.Search the Web for Herbicide
The hockey stick graph refers to the plot of temperature over the last 1000 years that shows a gradual temperature decline, until the early 20th century - then there is a 'ramp up' in temperature to a point not previously obtained in the proceeding 1000 years; hence demonstrating man's effect on the climate through industrialization. Made famous (or infamous) by its use in the 'Inconvenient Truth'.
The 'significance' of the graph as a true indicator of temperature (and especially the effective unprecedented temperature increases) has been a point of strong debate since it was published some ten years ago. Also the way the graph has been presented (smoothed/unsmoothed with or without error bands or indications of data sources and combinations there of) has lead to further controversy and heated discussions. Also the fact only 1000 years are presented, when we have proxies that go back many thousands of years is also a point of discussion.
For more background information see here .
The atmosphere up to 80 km (50 mi) in which the proportionality of principal gaseous constituents, such as oxygen and nitrogen, is constant.Search the Web for Homosphere
A "normal" wind turbine design, in which the shaft is parallel to the ground, and the blades are perpendicular to the ground.Search the Web for Horizontal Axis Wind Turbine
A hot water recirculator is basically a pump that is put in at the furthest part of the hot water system in your house, this pump has a return line back to the hot water tank. A thermometer is used to control when the pump goes on, idea is that hotter water is kept in the pipe at all times, so reducing the time it takes for the hot water to 'appear' at the tap or shower head.
This is good for existing installations, but do make sure the pipes are well lagged. For new builds it is often easier to use a smaller bore pipe, so less water rests in the pipe so it draws from the hot water tank quicker.
Humidity is a term for the amount of water vapor in the air, and can refer to any one of several measurements of humidity. Formally, humid air is not "moist air" but a mixture of water vapor and other constituents of air, and humidity is defined in terms of the water content of this mixture, called the Absolute humidity. In everyday usage, it commonly refers to relative humidity, expressed as a percent in weather forecasts and on household humidistat's; it is so called because it measures the current absolute humidity relative to the maximum. Specific humidity is a ratio of the water vapor content of the mixture to the dry air content (on a mass basis). The water vapor content of the mixture can be measured either as mass per volume or as a partial pressure, depending on the usage.
In meteorology, humidity indicates the likelihood of precipitation, dew, or fog. High relative humidity reduces the effectiveness of sweating in cooling the body by reducing the rate of evaporation of moisture from the skin. This effect is calculated in a heat index table, used during summer weather.Search the Web for Humidity
The substance which results from decay of plant or animal matter. Biodegradable matters form humus as they decompose.Search the Web for Humus
Energy Generation: A solar electric or photovoltaic system that includes other sources of electricity generation, such as wind or diesel generators.Search the Web for Hybrid System
The process by which the mechanical energy of moving water is transferred by a rotating turbine to a generator, where it is converted to electric energy and conveyed along transmission lines.Search the Web for Hydro Electric
The treatment of plant oils or animal fats, primarily with hydrogen gas in a refining process, for the production of synthetic hydrocarbons.Search the Web for Hydrogenation
The science dealing with the properties, distribution, and circulation of water.Search the Web for Hydrology
The decomposition of organic compounds by interaction with water.Search the Web for Hydrolysis
Hydronic flooring heating is where a network of water carrying pipes are embedded into the floor to transfer heat from a heat source (say solar hot water) to the floor - thereby providing a comfortable living environment. The only downside with such systems is that they depend upon the Sun to provide the warmth, this is often out of cycle with the demand for heat - i.e. you need to be warm in the evening and during cloudy days. Thermal mass can help phase shift the heating but you will often require additional back up heating as well.
This is often something which can only be done on a new build as you need to build the pipes into the structure of the floor. An option after build is to use a roof space heat recovery system to transfer the hot air from the roof into the living space by way of a filter and fan set up. The advantage with this is that such a system can also provide cooling air in Winter (as the roof space cools quicker than the living space below at night).
Search the Web for Hydroponics
The totality of water encompassing the Earth, comprising all the bodies of water; ice, and water vapor in the atmosphere.Search the Web for Hydrosphere
A proposition tentatively assumed. Science tests the logical consequences of a hypothesis against facts that are known or that may be determined.Search the Web for Hypothesis