Definitions - o

Ocean fertilization is a proposed form of geo-engineering that involves the introduction of iron particles to the upper ocean to stimulate a phytoplankton bloom.

In theory, the phytoplankton will then absorb CO2 before dying and sinking to the bottom of the ocean where the carbon will be sequestered.

An experiment in early 2009 in the Southern Ocean dampened hopes for widespread uptake of the technology after crustacean zooplankton fed on the bloom before it died and reintroduced the extracted CO2 into the atmosphere.

However, some scientists maintain that ocean fertilization could prove a cost effective means of reducing concentrations of CO2 in the atmosphere. Environmental groups counter that large scale ocean fertilization projects could have unexpected consequences on maritime food chains.

An ecosystem is a natural unit consisting of all plants, animals and micro-organisms in an area functioning together with all the non-living physical factors of the environment.

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Note: Just be clear, an ecosystem by definition does include 'us' and what we do, we all inhabit the same set of systems. Therefore be careful of ecosystem analysis's done without consideration of what impact (both in the good and bad sense) humans have made. There are very few ecosystems that we do not engage with over the longer term.

Materials may give off gases, some of which are toxic. Implicated in a variety of ailments, some people are more sensitive than others to these gases.

Deep clear lakes with few nutrients, little organic matter and a high dissolved-oxygen level.

The capacity to induce cancer.

A system capable of rotating about one axis to track the sun.

The cost of an economic activity foregone by the choice of another activity.

Environmental Pollution refers to the presence or introduction of known pollutants into an environment that result in a degrading of the environmental biosphere in terms of size, variety and longevity/sustainability.

Environmental Pollution refers to the presence or introduction of known pollutants into an environment that result in a degrading of the environmental biosphere in terms of size, variety and longevity/sustainability.

Compared to traditional aqueous inorganic redox flow batteries such as vanadium redox flow batteries and Zn-Br2 batteries, that have been developed for decades, organic redox flow batteries have emerged in last few years (since 2009) and hold great promise to overcome major drawbacks preventing economical and extensive deployment of traditional inorganic redox flow batteries. The primary merit of organic redox flow batteries lies at using sustainable and tunable organic redox active molecules, free of resources limit and enabling unlimited combinations of anode and cathode materials.

Organic foods are made in a way that limits or excludes the use of synthetic materials during production. For the vast majority of human history, agriculture can be described as organic; only during the 20th century was a large supply of new synthetic chemicals introduced to the food supply. This more recent style of production is referred to as "conventional." Under organic production, the use of conventional non-organic pesticides, insecticides and herbicides is greatly restricted and saved as a last resort.

Precipitation that results when moist air is lifted over a topographic barrier such as a mountain range.

Cyclic movement of oxygen in different chemical forms from the environment, to organisms, and then back to the environment.

Environmental Pollution refers to the presence or introduction of known pollutants into an environment that result in a degrading of the environmental biosphere in terms of size, variety and longevity/sustainability.

A family of man-made compounds that includes, but are not limited to, chlorofluorocarbons (CFCs), bromofluorocarbons (halons), methyl chloroform, carbon tetrachloride, methyl bromide, and hydrochlorofluorocarbons (HCFCs). These compounds have been shown to deplete stratospheric ozone, and therefore are typically referred to as ODSs.

Chemical compounds, such as carbon monoxide, methane, non-methane hydrocarbons, and nitrogen oxides, which in the presence of solar radiation react with other chemical compounds to form ozone, mainly in the troposphere.