Carbon footprint in the context of "Passive house"

Sustainable living describes a lifestyle that attempts to reduce the use of Earth's natural resources by an individual or society. Its practitioners often attempt to reduce their ecological footprint (including their carbon footprint) by altering their home designs and methods of transportation, energy consumption and diet. Its proponents aim to conduct their lives in ways that are consistent with sustainability, naturally balanced, and respectful of humanity's symbiotic relationship with the Earth's natural ecology. The practice and general philosophy of ecological living closely follows the overall principles of sustainable development.

One approach to sustainable living, exemplified by small-scale urban transition towns and rural ecovillages, seeks to create self-reliant communities based on principles of simple living, which maximize self-sufficiency, particularly in food production. These principles, on a broader scale, underpin the concept of a bioregional economy.

Energy conservation is the effort to reduce wasteful energy consumption by using fewer energy services. This can be done by using energy more effectively (using less and better sources of energy for continuous service) or changing one's behavior to use less and better source of service (for example, by driving vehicles which consume renewable energy or energy with more efficiency). Energy conservation can be achieved through efficient energy use, which has some advantages, including a reduction in greenhouse gas emissions and a smaller carbon footprint, as well as cost, water, and energy savings.

Green engineering practices improve the life cycle of the components of machines which convert energy from one form into another.

Airport Carbon Accreditation is a global carbon management programme for airports that independently assesses and recognises airports' efforts to manage and reduce their CO₂ emissions. Aircraft emissions, which are many times greater than airport emissions, are not included in the programme. The airport industry accounts for 5% of the air transport sector’s total carbon emissions.

The programme was launched by European airports' trade body ACI EUROPE at their Annual Congress in June 2009. It is independently administered by Environmental Minds, an international consultancy firm. The programme provides airports with a common framework for active carbon management with measurable goal-posts. Individual airport carbon footprints are independently verified in accordance with ISO 14064 (Greenhouse Gas Accounting) on the basis of supporting evidence. Claims regarding airports' carbon management processes are also independently verified by a group of 117 independent verifiers, based in 36 countries.

Corporate social responsibility (CSR) refers to companies conducting their core operations in a responsible and sustainable way to create a positive corporate social impact. It is a form of international private business self-regulation which aims to contribute to societal and environmental goals by reducing harm, for instance by reducing a company's carbon footprint or increasing positive outcomes for all stakeholders. It is related to the company's commitment to be ethical in its production, employment, and investment practices.

While CSR often takes the form of a philanthropic, activist, or charitable nature by supporting volunteering through pro bono programs, community development, and by administering monetary grants to non-profit organizations for the public benefit, corporations have been seen shifting to a holistic and strategic approach. Strategic CSR is a long-term approach to creating a net positive social impact based on brand alignment, stakeholder integration and ethical behaviour. Moreover, some scholars and firms are using the term "creating shared value", an extension of CSR which allows for social obligations to be met while the company reaps a profit.

Passive house (Passivhaus) is a voluntary building performance standard for very high energy efficiency and thermal comfort that substantially reduces a building’s carbon footprint. Buildings certified to the standard are ultra-low energy and typically require very little energy for space heating or cooling. The approach is used for housing and for non-residential buildings such as offices, schools, kindergartens and healthcare facilities. Energy efficiency is integral to architectural design rather than an add-on. Although most common in new construction, the principles are also applied in deep renovations (see EnerPHit).

As of January 2025, projects certified by the Passive House Institute (PHI) comprise over 47,400 units with about 4.32 million m² of treated floor area (TFA) worldwide; the public PHI database lists nearly 6,000 projects. In North America, the Passive House Institute US (PHIUS) reported 500+ total certified projects and ~1.6 million ft² certified in 2024 alone, with 4.4 million ft² design-certified that year. While early adoption concentrated in German-speaking countries and Scandinavia, certified projects are now documented across diverse climate zones, including hot-humid and tropical regions.

Cellulosic ethanol is ethanol (ethyl alcohol) produced from cellulose (the stringy fiber of a plant) rather than from the plant's seeds or fruit. It can be produced from grasses, wood, algae, or other plants. It is generally discussed for use as a biofuel. The carbon dioxide that plants absorb as they grow offsets some of the carbon dioxide emitted when ethanol made from them is burned, so cellulosic ethanol fuel has the potential to have a lower carbon footprint than fossil fuels.

Interest in cellulosic ethanol is driven by its potential to replace ethanol made from corn or sugarcane. Since these plants are also used for food products, diverting them for ethanol production can cause food prices to rise; cellulose-based sources, on the other hand, generally do not compete with food, since the fibrous parts of plants are mostly inedible to humans. Another potential advantage is the high diversity and abundance of cellulose sources; grasses, trees and algae are found in almost every environment on Earth. Even municipal solid waste components like paper could conceivably be made into ethanol. The main current disadvantage of cellulosic ethanol is its high cost of production, which is more complex and requires more steps than corn-based or sugarcane-based ethanol.

Individual action on climate change describes the personal choices that people can make to reduce the greenhouse gas emissions of their lifestyles and catalyze climate action. These actions can focus directly on how choices create emissions, such as reducing consumption of meat or flying, or can focus more on inviting political action on climate or creating greater awareness of how society can become greener.

Excessive consumption is one of the most significant contributors to climate change and other environmental issues along with population increase, although some experts contend that population remains a significant factor. High consumption lifestyles have a greater environmental impact, with the richest 10% of people emitting about half the total lifestyle emissions. Creating changes in personal lifestyle, can change social and market conditions leading to less environmental impact. People who wish to reduce their carbon footprint (particularly those in high income countries with high consumption lifestyles), can for example reduce their air travel for holidays, use bicycles instead of cars on a daily basis, eat a plant-based diet, and use consumer products for longer. Avoiding meat and dairy products has been called the single biggest way individuals can reduce their environmental impacts.

Geothermal power in Iceland refers to the use of geothermal energy in Iceland for electricity generation.

Iceland's uniquely active geology has led to natural conditions especially suitable for harnessing geothermal energy. Icelanders have long used geothermal energy for direct applications, such as heating homes and baths. The more recent, widespread adoption of geothermal energy as an energy source in Iceland was spawned by a need to stabilize energy prices and increase energy independence, allowing Iceland to increase reliance on geothermal energy for direct applications alongside electricity generation and contributing significantly to diminishing Iceland's carbon footprint.