The two most significant hazards associated with oil use are environmental damage from spills and leaks, and direct harm to human health through exposure to petroleum chemicals. Both hazards affect millions of people and ecosystems worldwide, and neither is limited to dramatic disasters. Everyday oil extraction, refining, transport, and combustion create ongoing risks that accumulate over time.
Environmental Damage From Oil Spills
Oil spills are among the most visible and devastating consequences of oil use. When crude oil enters marine or freshwater ecosystems, it kills wildlife through ingestion, smothering, and hypothermia. The Exxon Valdez spill in 1989 killed an estimated 250,000 seabirds, 2,800 sea otters, 300 harbor seals, 250 bald eagles, up to 22 killer whales, and billions of salmon and herring eggs. These numbers represent just one event in one location.
The damage goes beyond immediate die-offs. Fish embryos exposed to oil from the Deepwater Horizon spill showed delayed hatching, lower hatching success, and heart defects. This means a spill doesn’t just kill adult animals; it disrupts the next generation, weakening populations for years. Environmental recovery from large oil spills typically takes 2 to 10 years, but in heavily affected areas like those hit by Deepwater Horizon, full recovery may take more than 20 years. Long-term changes in community structure can persist even longer when the affected species are slow to reproduce.
Spills aren’t the only environmental concern. Leaking fuel storage tanks at gas stations contaminate groundwater in residential areas. Research on fuel stations in neighborhoods found petroleum hydrocarbon levels in nearby groundwater that exceeded safe limits at multiple sampling points. Contamination was highest close to fuel stations and decreased with distance, but measurable levels were detected even hundreds of meters away. This kind of slow, invisible pollution threatens drinking water sources in communities around the world.
Health Risks From Petroleum Exposure
Oil contains hundreds of chemical compounds, and many of them are toxic to humans. The health risks fall into three main categories: respiratory problems, neurological damage, and cancer. These effects hit oil industry workers hardest, but they also affect people living near refineries, fuel stations, and spill sites.
Respiratory Problems
Breathing in petroleum fumes irritates the airways and lungs. Short-term exposure causes throat irritation and coughing, but long-term exposure is more serious. Chronic inhalation of petroleum compounds causes inflammation in the nasal passages and lung tissue. In more severe cases, it leads to lung irritation and pneumonia. The mechanism is straightforward: petroleum hydrocarbons dissolve into the membranes lining the lungs, triggering an inflammatory response where fluid, proteins, and immune cells flood into the tiny air sacs where oxygen exchange happens.
Neurological Damage
Several compounds found in petroleum products are neurotoxic. Acute exposure causes central nervous system depression, which feels like dizziness, confusion, and drowsiness. Chronic exposure is far worse. People with prolonged exposure to gasoline vapors have developed tremors, abnormal gait, and speech problems, signs of permanent neurological damage. One petroleum compound, n-hexane, causes peripheral neuropathy, a condition where nerves in the hands and feet are damaged, leading to numbness, tingling, and weakness. Cleanup workers exposed to fine particulate matter from burning oil during the Deepwater Horizon disaster reported neurological symptoms both during the cleanup and one to three years afterward.
Cancer Risk
Benzene, a component of crude oil and gasoline, is a confirmed human carcinogen. Occupational exposure to benzene is associated with increased rates of leukemia, specifically a form called nonlymphocytic leukemia. Animal studies have confirmed that other petroleum compounds also cause tumors. Chronic inhalation of gasoline vapors produced liver tumors in laboratory mice, and ethylbenzene, another petroleum component, showed evidence of causing cancer in both rats and mice. For workers in the oil industry and people living near petroleum facilities, these are not theoretical risks.
Workplace Injuries in the Oil Industry
The physical process of extracting and handling oil is inherently dangerous. CDC data on the oil and gas extraction industry documented 2,101 severe work-related injuries over the reporting period. Nearly all of them (99.5%) were traumatic injuries: open wounds accounted for 35% of cases, bone and nerve injuries for 28%.
Hands and arms took the worst of it. Upper extremity injuries made up 43% of all severe injuries, and of those, 86% involved the hands specifically. The leading cause was contact with machinery and equipment, responsible for 61% of incidents. Construction, logging, and mining machinery alone caused 23% of all injuries. Slips, trips, and falls were the second most common cause at about 18%. Contract workers in drilling and well-servicing operations faced disproportionately higher injury rates compared to those in production operations, reflecting the more physically demanding and variable conditions of those jobs.
Why These Hazards Are Hard to Contain
One of the challenges with oil-related hazards is that they resist easy cleanup and prevention. Once petroleum hydrocarbons enter groundwater, they spread through underground water systems and are difficult to remove completely. Distance from a fuel source helps, with contamination levels dropping from 9.5 mg/L near one site to 1.1 mg/L at a location 535 meters away, but even low levels can exceed safety standards.
Oil spill recovery is similarly limited. While ecosystems do recover, the timeline of 2 to 20-plus years means that affected wildlife populations, fishing communities, and coastal economies bear costs long after the headlines fade. For human health, the latency period for cancer and neurological disease means that workers and residents may not see symptoms for years or decades after exposure, making it harder to connect the cause to the effect and harder to seek timely treatment.