Bronte Wells
Shale gas has been touted as a potential transition fuel to a low-carbon future, with new technologies fracturing dense rock to release natural gas. However, there are concerns about the environmental and health impact of its development, particularly regarding water pollution, air pollution, and land contamination. Studies disagree on whether shale gas is more or less polluting than coal, with some arguing that it has a lower carbon footprint, while others claim that shale gas production could be more environmentally damaging due to higher methane emissions and the risk of groundwater pollution. The debate remains unresolved, with the need for more data to reach a conclusion.
Characteristics and values of shale pollution:
| Characteristics | Values |
|---|---|
| Water pollution | Water is the main transmitter of oil shale industry pollutants. Oil shale processing results in the formation of wastewater containing phenols, tar, and other toxic products. |
| Air pollution | Oil shale-fired power plants emit atmospheric pollutants such as nitrogen oxides, sulfur dioxide, hydrogen chloride, and particulate matter (fly ash). |
| Greenhouse gas emissions | Shale oil and gas production releases carbon dioxide (CO2), a major greenhouse gas, with potentially higher emissions than conventional oil and gas production. |
| Waste generation | Shale oil production generates semi-coke and solid waste, which can include toxic and carcinogenic pollutants such as sulfates, heavy metals, and polycyclic aromatic hydrocarbons (PAHs). |
| Land use and ecological impact | Shale mining and processing require extensive land use, reducing ecosystem diversity and affecting grazing, agriculture, and local flora and fauna. |
| Health risks | There are potential links between living in oil shale areas and increased risks of asthma and lung cancer. |
| Fugitive emissions | Studies suggest varying rates of methane leakage from shale gas wells, with some indicating higher leakage rates than official estimates. |
| Economic considerations | Shale gas is economically attractive, but pursuing it may crowd out investment in genuinely green energy sources, hindering the transition to a renewable energy future. |
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What You'll Learn
Shale gas vs coal: which is more polluting?
The debate surrounding the environmental impact of shale gas and coal is ongoing, with some arguing that shale gas is a ""green energy of the future"" and others claiming that it is worse than coal in terms of climate impact.
Shale Gas
Shale gas is a natural gas that can be extracted from shale rock through hydraulic fracturing, or fracking. This process involves drilling down and sideways along a shale bed, cracking the rock with hydraulic pressure or explosions, and then releasing natural gas. Shale gas has been touted by the gas industry as a more environmentally friendly alternative to coal, with claims that it produces only about half of the carbon dioxide emissions of coal.
However, there are concerns about the potential negative impacts of shale gas extraction, including disastrous gas leaks, land contamination, and drinking water pollution. The process of fracking has been linked to these issues, and there are worries that the leakage of methane, a potent greenhouse gas, during the extraction process may offset any potential climate benefits. Studies have suggested that if more than 3.2% of natural gas leaks during production and transportation, shale gas becomes more polluting than coal.
Coal
Coal, on the other hand, is a more traditional fossil fuel that has been associated with high carbon dioxide emissions when burned. It also releases methane during the mining process, though at a much smaller scale compared to shale gas. The combustion and thermal processing of coal generate waste material and harmful atmospheric emissions, including carbon dioxide, nitrogen oxides, and sulfur dioxide. The mining and processing of coal also require extensive land use, reducing ecosystem diversity.
Comparison
The University of Michigan study compared the lifetime toxic chemical releases associated with coal-generated electricity and found them to be 10 to 100 times greater than those from shale gas obtained via fracking. However, other studies, including one from Cornell University, argue that the methane release during shale gas extraction may make it more environmentally damaging than coal over a 20-year period. This debate is further complicated by the potential for new technologies, such as carbon capture and storage, to reduce emissions from shale gas.
In conclusion, while shale gas has been promoted as a cleaner alternative to coal, the environmental impact of both energy sources is complex and multifaceted. The debate remains unresolved, with the potential for new data and technologies to shift the narrative in the future.
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The environmental impact of fracking
Water Contamination
One of the primary concerns associated with fracking is its potential to contaminate water sources. The process of hydraulic fracturing involves injecting water, chemicals, and sand into horizontal wells under high pressure to crack shale rock and release natural gas or oil. This process requires a significant amount of water, with estimates ranging from 100,000 to over 16 million gallons of water per well. This water is typically fresh water drawn from groundwater and surface water resources. The issue arises when the chemicals used in the fracking fluid leak or spill during transportation, mixing, or pumping, contaminating both groundwater and surface waterways such as rivers, lakes, and streams. This contamination can have severe ecological and health consequences, as evidenced by incidents like the Ohio site fire in 2014, where thousands of gallons of toxic chemicals leaked into a river tributary, killing over 70,000 fish.
Air Pollution
Fracking operations also contribute to air pollution. The combustion and thermal processing involved in shale gas extraction generate atmospheric emissions of carbon dioxide, nitrogen oxides, sulfur dioxide, and other harmful gases. Additionally, the operation of heavy equipment, use of diesel trucks, and flaring of excess natural gas at well sites can further degrade air quality. There are also concerns about the possible links from being in an oil shale area to a higher risk of asthma and lung cancer than other areas.
Solid Waste and Land Use
The waste material generated during fracking can occupy a greater volume than the extracted shale, posing disposal challenges. This waste may include semi-coke, combustion ashes, and toxic pollutants such as sulfates, heavy metals, and polycyclic aromatic hydrocarbons (PAHs). While solid waste is often disposed of in landfills or "heaps," it can still pose risks to groundwater and the broader environment due to the leaching of toxic compounds. Additionally, fracking requires extensive land use for mining, processing, and waste disposal, impacting ecosystems and biodiversity.
Climate Change
The extraction and production of shale gas contribute to greenhouse gas emissions, particularly carbon dioxide and methane. While the industry argues that shale gas has a lower carbon footprint than coal, the debate remains unresolved due to conflicting data and the potential for future developments in carbon capture and storage technologies. However, critics argue that pursuing shale gas as an energy source may crowd out investment in genuinely green and renewable energy sources, hindering progress in mitigating climate change.
Health Impacts
In addition to the environmental impacts, fracking has been linked to various health concerns. Studies have found increased levels of harmful chemicals in water near fracking sites, and there are worries about the potential contamination of drinking water sources. Additionally, children born near fracking sites have been found to have a higher risk of leukemia, and proximity to oil and gas wells has been associated with low birth weight. The combustion processes and release of toxic chemicals during fracking operations further contribute to air quality issues, posing respiratory health risks for nearby residents.
In conclusion, while fracking may offer certain advantages in terms of energy production and flexibility, its environmental and health impacts are significant and cannot be overlooked. More research and stricter regulations are needed to address these concerns and ensure the protection of ecosystems, water resources, air quality, and human health.
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Water contamination and pollution
Water is the primary transmitter of oil shale industry pollutants. The main environmental concern is preventing noxious materials from leaching from spent shale into the water supply. The oil shale processing is accompanied by the formation of process waters and wastewaters containing phenols, tar, and several other products that are highly separable and toxic to the environment. A 2008 programmatic environmental impact statement issued by the United States Bureau of Land Management stated that surface mining and retort operations produce 2 to 10 US gallons (7.6 to 37.9 litres) of wastewater per 0.91 tonnes of processed oil shale.
The process of hydraulic fracturing, while indispensable for enhanced oil and gas production, has been a topic of scientific and public debate due to its potential for inducing seismic activity and causing water contamination. The injection of high-pressure fluids into shale formations, a crucial step in this method, creates cracks through which artificially generated seismic energy is released. This seismic energy is transmitted underground and can cause noticeable ground-shaking in some instances. Hydraulic fracturing poses substantial threats to surface water and groundwater quality. Contamination can occur through various channels, including well leakage, cracks in rocks, the spillage of flowback water, or faulty cementing work that is supposed to seal the space between the well casing and the surrounding rock to prevent leaks.
The combustion and thermal processing of oil shale generate waste material that must be disposed of. To avoid groundwater contamination, the solid waste from the thermal treatment process is disposed of in an open dump (landfill or "heap") rather than underground, where it could potentially reach clean groundwater. As semi-coke can consist of up to 10% organics, it may pose a hazard to the environment due to the leaching of toxic compounds and the possibility of self-ignition. Mining influences the water runoff patterns of the affected area. In some cases, it requires lowering groundwater levels below the oil shale strata, which may have harmful effects on the surrounding arable land and forests.
The environmental impact of the oil shale industry includes land use, waste management, and water and air pollution caused by the extraction and processing of oil shale. Surface mining of oil shale deposits causes the usual environmental impacts of open-pit mining. Oil shale mining reduces the original ecosystem diversity, and the land must be reclaimed after mining, which takes time and may not re-establish the original biodiversity.
There are conflicting views on whether shale gas is more or less polluting than coal. Some studies suggest that shale gas could be more polluting, with higher carbon dioxide and methane emissions. However, other research, including a peer-reviewed study part-funded by ExxonMobil, concluded that shale gas has a 53% lower carbon footprint than coal. The question remains unresolved, and it is likely that more data is needed to reach a conclusion.
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Air pollution and health risks
Shale gas development has the potential to contaminate the environment with elevated chemical concentrations in both air and water. The combustion and thermal processing generate waste material, which must be disposed of, and harmful atmospheric emissions, including nitrogen oxides, sulfur dioxide, hydrogen chloride, and carbon dioxide, a major greenhouse gas. The waste material may consist of several pollutants, including sulfates, heavy metals, and polycyclic aromatic hydrocarbons (PAHs), some of which are toxic and carcinogenic.
The oil shale processing is accompanied by the formation of wastewater containing phenols, tar, and several other products, which are toxic to the environment. The main air pollution is caused by oil shale-fired power plants. These factory plants provide atmospheric emissions of gaseous products and airborne particulate matter (fly ash). Poor wastewater treatment poses the highest risk, with concentrations exceeding both Natural Background Values (NBVs) by a factor of 1,000–10,000 and Lowest Quality Standards (LQSs) by a factor of 10–100.
The health risks associated with air pollution from shale gas development include exposure to toxic chemicals such as VOCs, including trimethylbenzenes, xylenes, aliphatic hydrocarbons, benzene, and PAHs. High levels of exposure to crystalline silica that exceed health standards have been found in 68.5% of 111 full-air samples taken from 5 different shale gas regions. The development of shale gas has been linked to increased childhood asthma hospitalizations, increased pneumonia hospitalizations in the elderly, and an increased risk of heart attacks and heart attack-related mortality.
There is also a potential link between living in an oil shale area and a higher risk of asthma and lung cancer than in other areas. The carbon footprint of shale gas is also a concern, with some studies suggesting that shale gas could be more polluting than coal if more than 3.2% of natural gas leaks during production and transportation. However, there is ongoing debate and conflicting research on this topic, with some studies concluding that the carbon footprint of shale gas is lower than that of coal.
Overall, the air pollution and health risks associated with shale gas development are significant and require further research and regulation to mitigate their impacts on the environment and human health.
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The future of shale gas
Shale gas is an available source of unconventional natural gas. The future of shale gas is a topic of debate, with some touting it as a green energy source of the future, while others argue that it is more polluting than traditional energy sources like coal.
The case for shale gas:
Shale gas has been hailed as a green energy source that can power the globe for centuries. Proponents of shale gas argue that new technologies can be used to fracture dense rock and release natural gas, resulting in only about half of the carbon dioxide emissions of coal. Shale gas is also seen as a way to improve energy security and reduce dependence on foreign oil. The development of shale gas is expected to significantly increase energy security and help reduce greenhouse gas pollution. For instance, the availability of large shale gas reserves in the US has led to proposals for natural gas-fired power plants to replace coal plants, reducing carbon emissions. Shale gas production has also led to major increases in reserves of natural gas, with estimated reserves in the United States in 2008 being 35% higher than in 2006.
The case against shale gas:
Critics argue that the side effects of shale gas production, such as land contamination, water pollution, and disastrous gas leaks, outweigh its potential benefits. There are reports of drinking water being rendered unsafe due to pollution from drilling, and families suffering from health problems as a result of living near shale gas sites. Additionally, the production and transportation of shale gas can result in methane leaks, which contribute to climate change. The waste material generated during shale oil production may include pollutants such as sulfates, heavy metals, and polycyclic aromatic hydrocarbons (PAHs), which can be toxic and carcinogenic. The combustion and thermal processing of shale gas also generate carbon dioxide, a major greenhouse gas, and waste material that must be disposed of safely.
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Frequently asked questions
It is unclear whether shale gas is less polluting than coal. A study by Cornell University found that shale gas could be more environmentally polluting than coal. However, this study was criticized for its research methodology. A peer-reviewed study part-funded by ExxonMobil concluded that shale gas has a carbon footprint that is 53% lower than coal.
Shale gas is considered to be a greener alternative to natural gas. However, the environmental impact of shale gas development, particularly through fracking, has raised concerns about its sustainability.
The environmental impacts of shale gas development include increased greenhouse gas emissions, water consumption and pollution, surface disturbance, and adverse effects on local ecosystems and water runoff patterns.
