by Supriya Ghosh | 9 Apr 2024
Acidification is an environmental problem caused by acidified rivers/streams and soil due to anthropogenic air pollutants such as ammonia, nitrogen oxides and sulphur dioxide. When acids are emitted, the pH factor falls and acidity increases, which for example can involve the widespread decline of coniferous forests and dead fishes in lakes in Scandinavia.
In the ocean, we define acidification as a reduction of the pH over an extended period of time, and it is caused primarily by an uptake of carbon dioxide (CO2) from the atmosphere: the ocean absorbs the extra amount of CO2 emitted in our atmosphere. We are already observing this change in the deep ocean, especially at high latitudes.
It affects marine organisms, with a consequence on the ecosystems they belong to in and above water: disrupting the food chain (increase of the mobilisation and the leaching behaviour of heavy metals in soil), altered prey availability (for example, krill for whales), impact on habitats (lower pH destroys coral reefs), but also the amplification of noise pollution by a modification of the underwater acoustics.
As an indicator, Acidification Potential calculates the impact of the potential change in acidity in the soil due to the atmospheric deposition of sulfates, nitrates, phosphates, and other compounds.
by Supriya Ghosh | 9 Apr 2024
In the stratosphere, an ozone-rich layer called the Ozone layer exists. The formation of the ozone hole is directly linked to the stratosphere’s temperature. Once temperatures drop below -78°C, polar stratospheric clouds tend to form, exacerbating ozone depletion over both of the Earth’s hemispheres.
The Ozone layer acts like sunscreen for all living organisms, shielding the Earth’s surface from most of the sun’s UV light. Its depletion could cause serious damage for humans, animals, plants and materials. Ozone Depletion Potential (ODP) calculates these destructive effectives over a time horizon of 100 years.
by Supriya Ghosh | 9 Apr 2024
The Earth receives energy from the sun through solar radiation, with about half of this energy being absorbed by the earth’s surface. The other half is reflected back into the atmosphere as infrared radiation or heat. Greenhouse gases (GHGs) trap this radiation in the atmosphere, thereby heating the Earth. Consequently, the more GHGs that are present in the atmosphere, the warmer the Earth’s temperature becomes. This process is known as the greenhouse effect.
In order to make meaningful comparisons between GHGs, scientists have adopted CO2 as the benchmark for measuring their heat-trapping abilities. CO2 is a clear, odourless gas produced during carbon combustion and in the respiration of living organisms. The heat-trapping potential of a gas, measured against CO2 over a fixed period, is known as Global Warming Potential (GWP). CO2 is used as a benchmark to measure the GWP of substances, which is expressed in kg of CO2eq.
Ultimately, GWP evaluates the potential impact of different gaseous emissions on climate change by calculating the radiative force over a 100-year time horizon.
by Supriya Ghosh | 9 Apr 2024
On Earth, pollution mixed with heat and sunlight creates a concentration of Ozone (O3 gaz) in the atmosphere (stratosphere + troposphere). This gaseous element, when released in the stratosphere, acts like sunscreen for all living organisms, shielding the Earth’s surface from most of the sun’s UV light (unless it creates depletion in the atmospheric layer).
However, when this concentration remains at ground level in the troposphere, it affects the air that we breathe as humans and therefore starts becoming a health hazard. When inhaled, ozone reacts chemically with many biological molecules in the respiratory tract, leading to a number of adverse health effects.
We call this secondary air pollution Photochemical Oxidation, also known as Summer Smog. Chemically speaking, photo-oxidant formation is a photochemical creation of reactive substances: it is formed in the atmosphere by nitrogen oxides and volatile organic compounds in the presence of sunlight, often the consequence of emissions from fossil fuel combustion. POP calculates the destructive effects of ozone in the troposphere over a time horizon of 100 years.
by Supriya Ghosh | 9 Apr 2024
The Ecopoint represents the total potential environmental load of a product or solution: it is a cumulative, more holistic value that includes the impacts on human health, the ecosystem and resource diversity. The single numerical score of Ecopoint represents the overall impact of a product or solution. This score can be interpreted as a measure of sustainability performance, where lower scores indicate lower environmental impact.
The Ecopoint therefore allows us to group the 9 other environmental indicators in three different categories of damage: (1) Human Health, (2) Ecosystem quality and (3) Resources. This way, obtaining a single score representing the total environmental impacts during the product’s life cycle is possible.
Human Health and Ecosystem Impact
The ecopoint index factors in the impact on human health and ecosystems, how a product’s life cycle may affect human well-being including health risks related to exposure to pollutants, and how it may impact ecosystems, including biodiversity and habitat disruption.
Resource Diversity
This takes into account the diversity and availability of natural resources, as well as the potential depletion of non-renewable resources and the consequences for future generations.
The Ecopoint index is essentially a form of multi-criteria assessment that allows decision-makers to weigh different environmental and sustainability factors. It acknowledges that environmental issues are interconnected, and a single value can provide a more comprehensive understanding of the trade-offs and impacts associated with a product.
