Bronte Wells
Households contribute significantly to global pollution levels, with transportation and housing being the primary sources. The average US household, for instance, emits 5.43 gigatons of carbon dioxide equivalent annually, with 82.3% produced domestically. Notably, the more affluent a household, the higher its average carbon emissions. The richest 10% of households consume almost half of the energy linked to land transport and three-quarters of aviation energy. Inequality in access to clean fuels and technologies also plays a role in household pollution, with 2.1 billion people worldwide relying on solid fuels and inefficient stoves, resulting in harmful household air pollution. This inequality disproportionately impacts women and children, who bear the greatest health burden from polluting fuels and technologies in homes.
| Characteristics | Values |
|---|---|
| Number of people worldwide cooking with open fires or inefficient stoves fuelled by kerosene, biomass, coal, etc. | 2.1 billion |
| Number of deaths caused by household air pollution in 2020 | 3.2 million |
| Number of children under the age of 5 who died due to household air pollution in 2020 | 237,000+ |
| Number of people worldwide who cook with solid fuels | 2.1 billion |
| Percentage of people in urban areas relying on polluting fuels and technologies in 2021 | 14% |
| Percentage of the global rural population relying on polluting fuels and technologies in 2021 | 49% |
| Number of people estimated to lack access to clean fuels and technologies in 2030 | 1.8 billion |
| Number of people in sub-Saharan Africa who lacked access to clean cooking alternatives in 2022 | 923 million |
| Number of megatons of carbon dioxide equivalent emitted by U.S. household transportation | 5.43 |
| Percentage of emissions produced domestically | 82.3% |
| Average energy use for single-family houses | 80.9M Btu |
| Average energy use for mobile homes | 61.3M Btu |
| Average energy use for apartments with 2-4 units | 53.5M Btu |
| Average energy use for apartments with 5+ units | 33.7M Btu |
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What You'll Learn
Household air pollution from inefficient combustion of solid fuels
Household air pollution is caused by the inefficient combustion of solid fuels, such as wood, coal, charcoal, crop waste, and dung, as well as kerosene. This is particularly prevalent in developing countries, where inefficient cooking and heating methods are used in poorly ventilated homes. The World Health Organization (WHO) estimates that 2.1 billion people worldwide rely on these polluting fuels and technologies for cooking, with a significant proportion of these people living in low- and middle-income countries.
The use of inefficient and polluting fuels and technologies in households results in the emission of harmful pollutants, including particulate matter, gases, and black carbon (sooty particles). These emissions have detrimental effects on human health, with the World Health Organization estimating 3.8 million deaths globally per year attributable to household air pollution. The greatest burden of household air pollution-related premature deaths is among children with pneumonia exposed to biomass smoke. Adults are also severely impacted, with cardiovascular disease, chronic obstructive pulmonary disease, and lung cancer being leading causes of disability and premature death, particularly in women, who are typically the primary cooks in developing countries.
The combustion of organically derived solid fuels emits particles and gases similar to those produced by burning tobacco. This results in adverse health effects, including oxidative stress in the airways and alveoli, leading to stimulation of alveolar macrophages and injury to the epithelial lining. The inhalation of these pollutants can also impair immune response and reduce the oxygen-carrying capacity of the blood. Additionally, the time spent using and preparing fuel for inefficient devices constrains opportunities for health, development, and other productive activities.
To address this issue, the WHO has issued guidelines for indoor air quality, providing practical evidence-based guidance on clean fuels and technologies. These guidelines include recommendations on specific fuels and technologies, discouraging the use of kerosene and unprocessed coal, and emphasizing the importance of addressing all household energy uses, such as cooking, space heating, and lighting, to protect health and the environment. Strategies to increase the adoption of clean household energy include policies that provide financial support for cleaner alternatives, improved ventilation and housing design, and communication campaigns to encourage clean energy use.
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Household carbon footprint from transportation
Household carbon emissions from transportation are a significant contributor to global warming and climate change. In the United States, greenhouse gas emissions from transportation account for about 28% of total US greenhouse gas emissions, making it the largest contributor. The average US household has a carbon footprint of 4 tons of carbon dioxide equivalent per year, with 16-20% occurring in other countries.
The variations in household carbon footprints from 1995 to 2014 were largely driven by transportation use, including emissions from vehicle manufacturing, fuel, and public transportation. Transportation emissions, both per capita and per household, have continued to rise over time, despite improvements in fuel economy and reduced tailpipe emissions. This is due to people's desire to travel more, increased ownership of household vehicles, and a lower average number of vehicle occupants.
The carbon footprint of a household generally increases with income. Wealthier households tend to have a larger carbon footprint, as they can afford more vehicles and travel more frequently. In 2009, households with less than $30,000 in annual disposable income made up 25.7% of the US population but contributed only 19.3% of household carbon emissions. On the other hand, households with over $100,000 in annual income accounted for 22.3% of the population but were responsible for nearly a third of the total carbon footprint.
There are several strategies to reduce household carbon emissions from transportation. These include the use of low-carbon fuels, improved vehicle technologies, reducing the number of vehicle miles traveled, and operating vehicles more efficiently. Additionally, households can reduce their carbon footprint by eliminating food transportation for one year, which is equivalent to saving the GHG emissions of driving 1,000 miles. Shifting to a vegetarian meal one day a week can also save the equivalent of driving 1,160 miles.
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Energy use and household size
Household energy use is a significant contributor to pollution and greenhouse gas emissions. In the United States, residential energy use accounts for about 20% of greenhouse gas emissions, and if considered a country, these emissions would make it the world's sixth-largest emitter, surpassing Germany.
The average US home consumed approximately 147 kilowatt-hours per square meter (kWh/m2) in 2015. Climate has a strong correlation with household energy intensity, with states in colder regions, such as the north-central and northeast, exhibiting markedly higher energy intensity. On the other hand, states in warm or mild regions have lower energy intensity.
The number of people per household, floor space, building attributes, and other factors can influence energy efficiency. Smaller houses tend to use less energy, with apartments having the lowest average energy use. The type of housing, such as detached single-family homes, mobile homes, or apartments, also plays a role in energy consumption.
Household energy use includes cooking, heating, lighting, and refrigeration. Heating and cooling alone account for about 44% of energy use in US residential buildings. The thermostat setting significantly impacts energy consumption, with a 3% savings in heating energy for each 1-degree decrease in temperature. Similarly, a 1-degree increase in the thermostat setting for cooling results in a 6% savings in energy use.
Household energy emissions are a significant source of black carbon, a short-lived climate pollutant. Globally, cooking with solid fuels like wood, charcoal, and coal contributes up to 25% of total controllable black carbon emissions, with higher percentages in some African and Asian countries. Burning solid fuels indoors also releases toxic pollutants, leading to indoor air pollution that can be much worse than outdoor air quality guidelines.
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Household air pollution from cooking fuels
Household air pollution (HAP) is a major risk factor for health and is responsible for an estimated 3.2 million deaths per year, including over 237,000 children under the age of five. It is caused by the use of inefficient and polluting fuels and technologies, such as solid fuels and kerosene, in open fires and inefficient stoves. Solid fuels include wood, crop waste, charcoal, coal, and dung. These fuels are often used in low- and middle-income countries, with a large discrepancy between urban and rural areas; in 2021, only 14% of people in urban areas relied on polluting fuels, compared to 49% in rural areas.
The World Health Organization (WHO) has issued guidelines for indoor air quality, including recommendations to discourage the use of kerosene and unprocessed coal, and to address all household energy uses, particularly cooking, space heating, and lighting. Cleaner fuels include solar, electricity, biogas, liquefied petroleum gas (LPG), natural gas, alcohol fuels, and biomass stoves that meet emission targets.
The incomplete combustion of solid fuels produces high levels of HAP and a range of harmful pollutants, including particulate matter, sulfur oxides, nitrogen oxides, carbon monoxide, polycyclic aromatic hydrocarbons, formaldehyde, and dioxins. These pollutants have been linked to adverse health effects such as respiratory conditions, cardiovascular diseases, low birth weight, tuberculosis, and cancer. Women and children bear the greatest health burden from polluting fuels as they are typically responsible for household chores such as cooking and collecting firewood, spending more time exposed to harmful smoke.
The use of solid cook fuels has a significant impact on ambient air pollution levels and can cause ill health far from the source. For example, one year of cooking on a three-stone stove emits particles equivalent to the emissions of 20 diesel trucks driving 50,000 kilometers a year. With 170 million households in India alone using biomass cooking fuel, the emissions are considerable.
To reduce household air pollution and protect health, it is essential to expand the use of clean fuels and technologies. Strategies to increase the adoption of clean household energy include financial support for cleaner technologies and fuels, improved ventilation and housing design, and communication campaigns to encourage clean energy use.
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Household emissions from electricity generation
Electricity generation is a major contributor to household emissions. While electricity is clean at the point of final use, the process of generating it is emissions-intensive. In the US, for example, fossil fuels like coal, natural gas, and petroleum are the source of about 60% of total annual utility-scale electricity net generation, but they account for 99% of the associated CO2 emissions.
The burning of fossil fuels for electricity generation contributes significantly to global carbon dioxide (CO2) emissions, with around 34 billion tonnes of CO2 released into the atmosphere annually. This has a notable impact on the climate, as the build-up of greenhouse gases, particularly CO2, leads to warming in many parts of the world.
Household electricity consumption varies depending on macro and micro factors, such as average income, population, household income, and household size. In Europe, the average carbon footprint of a grid-connected household is less than 2 tCO2e, with annual emissions ranging from 0.09 to 6.44 tCO2e.
To reduce emissions from household electricity consumption, several strategies can be employed. Carbon offsetting, for instance, is a mechanism that allows households to achieve carbon neutrality by purchasing voluntary carbon offsets. Modifications in energy use patterns, such as transitioning to cleaner fuels and technologies, improving ventilation, and adopting energy-efficient practices, are also crucial.
Additionally, the type of energy source used for electricity generation plays a significant role in emissions. Nuclear power, for instance, emits only a few grams of CO2 equivalent per kWh of electricity produced, while renewable sources like wind and solar produce varying amounts of CO2-equivalent emissions over their life cycles.
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Frequently asked questions
This depends on several factors, including the household's energy source, location, and income. On average, U.S. households generate 5.43 gigatons of carbon dioxide equivalent emissions every year, with 82.3% of those emissions produced domestically.
Transportation and housing are the biggest contributors to a household's carbon footprint, accounting for more than half of all U.S. household emissions. The more money a household has, the more carbon dioxide equivalent it emits per year.
Household air pollution is responsible for an estimated 3.2 million deaths per year, including over 237,000 children under the age of five. It is associated with respiratory conditions such as pneumonia, chronic obstructive pulmonary disease, lung cancer, stroke, and cardiovascular disease.
Households can reduce their pollution output by adopting cleaner energy sources, such as solar, electricity, biogas, and natural gas. Additionally, small changes such as switching to energy-efficient lighting, reducing water usage, and choosing less carbon-intensive meats can also help lower a household's carbon footprint.
