Habitat refers to the native home of an animal or a plant.

Halogen bulbs are a type of incandescent light with greater energy-efficiency level than standard bulbs.

Handmade or artisan is a sustainability standard that an ekko.world trader might claim.

Handmade products range from small production home businesses to highly crafted goods like furniture or artwork and are created in a traditional or non-mechanized way using high quality componentry.

By purchasing handmade, you are supporting someone making quality items - handmade with love, creativity and uniqueness. Traders who produce or sell artisan goods honour the craftsmanship and skill that goes into making a one of a kind product.

An environmental hazard refers to the potential for any situation or event to pose a threat to the surrounding natural environment, and to cause human illness or injury.

Hazardous air pollutants refer to a group of air pollutants that may be harmful to human health and the natural environment.

Hazardous household waste refers to hazardous products used and disposed of from residential properties such as paints, stains, varnishes, solvents, pesticides, and other materials that may be toxic or corrosive.

Hazardous waste refers to waste that may pose a danger to human health or the environment when improperly managed. Typical hazardous waste is toxic, corrosive, ignitable, explosive, or chemically reactive. 

Heat island effect refers to a ‘dome’ of higher temperatures over an urban area caused by heating of buildings and pavement areas, and pollutant emissions.

Heavy industry refers to manufacturing activities undertaken to convert large volumes of raw materials and partially processed materials into products of higher value. This type of industry is known for considerable capital investment in large machinery, high energy use, and final products of relatively low value per unit weight.

Heavy metals include arsenic, barium, cadmium, chromium, cobalt, lead, manganese, mercury, selenium, and zinc. Heavy metals are used as pigments in paints and included in many products. They can be toxic to highly-toxic. 

Hemp is a renewable resource used for producing rope, sacking, carpet, nets and webbing. Hemp is also being used in increasingly for paper manufacturing.

Herbicide is a chemical pesticide designed to kill plants, weeds, or grasses.

High Tech for Sustainability is a sustainability standard that an ekko.world trader might claim. 

Such a trader is utilizing high tech products to offer alternative solutions to unsustainable products & practices or utilizes high tech solutions to disseminate information, generally at a speed far greater than would be otherwise achievable.

Home Grown is a sustainability standard that an ekko.world trader might claim.

Home grown produce has usually been grown in someone's backyard. Supporting small scale, local produce helps build local grower networks and community. You can also be pretty sure your produce is both seasonal and fresh.

Hormone Free is a sustainability standard that an ekko.world trader might claim.

Hormones are a part of physiological makeup, so all animal products - meat, milk or eggs, contain naturally-occurring hormones.

A meat product that claims to be 'Hormone Free' is, in reality one raised without added hormones.

Household waste or domestic waste refers to solid waste known as garbage or rubbish, which normally originates in a private residence. Domestic waste may contain a significant amount of toxic or hazardous waste.

Humidity is a term for the amount of water vapour in the air and commonly refers to relative humidity, which is expressed as a percentage in weather forecasts. 

Humus is the most advanced state of the breakdown of compost, which is a result of decayed plant or animal matter.

A hybrid system is a solar electric or photovoltaic system that includes other sources of energy generation, such as wind power or diesel generators.

A hybrid vehicle is a vehicle that is powered by more than one source, such as a combination of gasoline and electricity. A hybrid vehicle can capture the energy used in braking and/or excess heat from the engine to recharge the electric motor, thus reducing fuel consumption.

Hydroelectric power is generated by using the force of falling water to turn turbines and produce electricity.

Hydrofluorocarbons (HFCs) are used as a substitutes for ozone-depleting compounds such as chlorofluorocarbons (CFCs) in uses such as refrigeration, air conditioning, and the production of insulating foams.

Hydrogen fuel cells are an alternative power source for engine, and a substitute for carbon-based oil fuels.

The hydrologic cycle refers to the movement and distribution of water from the moment it falls as rain until it is returned to the atmosphere by evaporation or transpiration.

Hydronic flooring heating is an environmentally-friendly way of heating indoor spaces using water as a heat transfer mechanism.  The system involves a network of water carrying pipes embedded into the floor to transfer heat from a heat source (such as solar hot water) to the floor and providing a comfortable living environment. 

Hydroponics refers to the process of growing plants without soil using solutions and water as the only nutrients. Gravel and sand are typical of hydroponic 'garden' beds.