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.
Search the Web for Ocean FertilizationA green roof is a conventional roof covered with a layer of vegetation, also known as “living roofs”. Green roofs serve several purposes for a building, such as absorbing rainwater, providing insulation, creating a wildlife habitat and helping to lower urban air temperatures and combat the urban heat island effect. There are two types of green roofs: intensive roofs, which are thicker and can support a wider variety of plants but heavy and require ongoing maintenance, and extensive roofs, which are covered in a light layer of vegetation and are lighter than an intensive green roof.
Search the Web for Off GridMaterials 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.
Search the Web for Off-GassingDeep clear lakes with few nutrients, little organic matter and a high dissolved-oxygen level.
Search the Web for Oligotrophic LakesThe capacity to induce cancer.
Search the Web for OnconogenicityA system capable of rotating about one axis to track the sun.
Search the Web for One-Axis TrackingA cell producing an electric current direct from a chemical reaction.
Search the Web for Opportunity CostTheory that proposes large scale climate changes are due in part to the variations in precession, eccentricity and obliquity that affects the amount of solar radiation received by the earth.
Search the Web for Orbital ForcingOrganic farming is the form of agriculture that relies on techniques such as crop rotation, green manure, compost, biological pest control, and mechanical cultivation to maintain soil productivity and control pests on a farm. Organic farming excludes or strictly limits the use of synthetic fertilizers and synthetic pesticides, plant growth regulators, livestock antibiotics, food additives, and genetically modified organisms.
Search the Web for Organic FarmingCompared 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.
Search the Web for Organic Flow BatteryA cell producing an electric current direct from a chemical reaction.
Search the Web for Organic FoodPrecipitation that results when moist air is lifted over a topographic barrier such as a mountain range.
Search the Web for Orographic RainfallCyclic movement of oxygen in different chemical forms from the environment, to organisms, and then back to the environment.
Search the Web for Oxygen CycleThe biophysical environment is the symbiosis between the physical environment and the biological life forms within the environment, and includes all variables that comprise the Earth's biosphere.
Search the Web for OzoneA 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.
Search the Web for Ozone Depleting SubstanceChemical 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.
Search the Web for Ozone Precursors