El fracking It is a widely used technique to extract gas natural and other fossil fuels from underground rock formations. This technique, also known as hydraulic fracturing, involves drilling into the earth and injecting a mixture of water, chemicals and sand at high pressure into rock formations, causing fractures in the rocks and releasing gas or oil that can be extracted. This process has been widely adopted in countries such as the United States to increase energy production, but it is not without its drawbacks. environmental and public health effects which are causing growing concern.
Natural gas exploited through fracking is trapped in the pores and fissures of sedimentary rock formations, especially in deposits of slates and marls, where the low permeability of the rocks prevents their migration, making it necessary to use techniques such as fracking to extract it. However, despite its economic benefits, fracking has been the subject of intense criticism due to its negative impacts on the environment.
What is fracking?
Fracking involves drilling a well, either vertically or horizontally, through which a mixture of water, sand and chemicals is injected at high pressure. This mixture causes small fractures in rock formations, allowing natural gas trapped in the rock's pores to flow into the well to be collected. Fracking initially allowed the exploitation of previously inaccessible energy sources, particularly shale gas. However, the process is causing great concern because it uses harsh chemicals and large amounts of water, as well as releasing polluting gases.
Environmental impacts of fracking
On an environmental level, fracking has multiple impacts affecting various aspects of the natural environment:
- Water contamination:During the process, there is a risk that chemicals used in high-pressure injection, as well as methane gas, will leak into groundwater. In addition, fracking generates large quantities of wastewater laden with pollutants, such as carcinogenic hydrocarbons (benzene) and radioactive elements (radium), which pose a threat to drinking water sources.
- Lack of water:Approximately 90% of the water used in fracking does not return to the surface, resulting in a significant reduction in available water resources, especially in areas where water is already a scarce resource. Diversion of water from rivers and aquifers for fracking operations can also have serious consequences for agriculture and human consumption.
- Methane and greenhouse gas emissions: The natural gas extracted is composed mainly of methane, a potent greenhouse gas that has a negative impact on global warming, being 85 times more potent than CO2. Methane leaks, both during drilling and in the production and storage phases, can offset any benefits gained by switching from coal to natural gas.
- Induced earthquakesFracking has been shown to trigger earthquakes in geologically stable areas by injecting high-pressure water deep into the earth. These earthquakes are difficult to predict and pose a threat to infrastructure and populations.
Effects on human health
Fracking not only affects the environment, but also has direct consequences on health, especially in communities close to extraction sites:
- Respiratory problems: Evaporation of wastewater in open-air ponds releases volatile organic compounds into the atmosphere, which can cause respiratory problems such as asthma and bronchitis. In addition, prolonged exposure to pollutants such as hydrogen sulfide can cause high blood pressure, anemia and cancer.
- Increases in radon exposure: Areas near fracking may experience high levels of radon, a radioactive gas that is considered the second leading cause of lung cancer in the world, after smoking. Radon can dissolve in groundwater and be released into the air, affecting nearby inhabitants.
- Neurological and reproductive damage: Some of the chemicals used in fracking can cause infertility, birth defects and even brain damage due to prolonged exposure to toxic substances present in water or air. These effects are especially serious for workers in the sector and in nearby communities.
Economic impact and its controversies
Fracking has been vigorously defended by many companies and governments because of its immediate economic benefits. This technique not only creates direct and indirect jobs, but also facilitates domestic access to energy sources, which can reduce dependence on imported fossil fuels. However, many critics point out that these short-term advantages do not outweigh the long-term environmental and health costs.
In addition, in many cases the jobs created are temporary, and local communities may be affected by pollution and health problems long after companies have abandoned the extraction sites. Despite the initial economic boost, in the long term, these operations can leave communities with irreversible health problems and contaminated soils that are difficult to rehabilitate.
How can fracking be regulated?
One of the main challenges facing governments is properly regulate fracking to minimise its negative impacts. In some countries, such as France and Germany, fracking has been banned, while in others, such as the United States, it remains a common practice. Effective regulation must include:
- Transparency in the chemicals used: Many companies involved in fracking do not disclose the exact composition of the fluids they inject into the ground, making it difficult to assess their impact on health and the environment. Requiring full disclosure of these products is crucial for effective regulation.
- Protection of water sources: Strict controls must be implemented to prevent contamination of aquifers and surface waters. This includes improved well sealing technologies and waste management.
- Limitations on methane emissions: Methane leaks must be monitored and minimised, and governments must impose strict limits on permitted emissions.
- Previous seismic assessments: Before starting fracking operations, detailed assessments of the geological structure of the area must be carried out to identify risks of induced earthquakes.
Alternatives to fracking
As concerns grow over the negative effects of fracking, many experts and activists are advocating for the renewable energy development as a more sustainable alternative. Using solar, wind and geothermal energy can not only reduce dependence on fossil fuels, but also have a much smaller impact on the environment and human health. Ultimately, the transition to cleaner forms of energy can offer a sustainable solution to the global energy problem without compromising the health of the planet or its inhabitants.
It is clear that while fracking may offer short-term economic benefits, its negative environmental and health impacts pose a considerable challenge. If governments and companies do not take strict measures to mitigate these effects, the consequences of this technique will be profound and long-lasting.