Chapter IaS4: How Do Science and Technology Impact Society?
Welcome to Ideas about Science 4 (IaS4)! In this chapter, we look at how science and technology shape our daily lives, how we balance risks against benefits, and how society makes big decisions about new technologies.
Don't worry if this seems a bit different from calculating speeds or balancing chemical equations. IaS4 is all about scientific thinking in the real world. By the end of these notes, you will know exactly how to answer exam questions on risk, ethics, sustainability, and decision-making with confidence!
---1. Science and Technology: The Good and the Unintended
Positive Impacts of Science (IaS4.1)
Scientific discoveries have transformed the world, improving human health, comfort, and communication. Here are key examples across the sciences:
• Biology: Water treatment using chlorination kills dangerous pathogens and prevents deadly waterborne diseases (like cholera). Vaccines protect populations by establishing herd immunity. Infertility treatments and hormone therapies give people reproductive choices.
• Chemistry: The Haber process produces synthetic fertilisers, dramatically increasing crop yields to feed billions of people. Catalytic converters and low-sulfur fuels reduce toxic exhaust emissions from cars.
• Physics: Electromagnetic radiation enables medical imaging (such as X-rays and gamma-ray tracers) to diagnose injuries and diseases inside the body without surgery. Low-carbon electricity generation (like nuclear and renewables) powers our homes.
Unintended and Undesirable Consequences (IaS4.2)
Every new technology comes with trade-offs. An advance designed to solve one problem can sometimes create new, unforeseen risks:
• Fertilisers & Eutrophication: While fertilisers boost crop growth, excess runoff into rivers causes eutrophication, leading to algal blooms that block sunlight and starve aquatic life of oxygen.
• Nanomaterials: Nanoparticles (like nanosilver in socks to kill bacteria or zinc oxide in sunscreens) have great benefits, but their microscopic size means they might accumulate in living organisms or wash into aquatic ecosystems with unknown long-term toxicity.
• Medical Radiation: X-rays provide life-saving diagnoses, but exposure to ionising radiation damages DNA and increases cancer risk.
• Nuclear Power: It produces large amounts of low-carbon electricity, but produces radioactive waste that remains hazardous for thousands of years and requires secure, long-term storage.
Key Takeaway: Technological advances bring enormous benefits, but almost every technology carries side effects or unintended risks that must be managed.
---2. Understanding Risk: Hazard vs. Risk & Actual vs. Perceived Risk
Crucial Exam Distinction: Hazard vs. Risk
Examiners frequently test whether you know the difference between these two words. Do not mix them up!
• Hazard: Anything that has the potential to cause harm (e.g., chlorine gas is toxic, electricity can cause a shock, UV radiation can damage skin).
• Risk: The chance (probability) that someone will actually be harmed by the hazard under specific conditions of exposure.
Analogy: A tiger in a locked, reinforced cage is a severe hazard (it can bite), but the risk of it biting you is almost zero because you are separated from it.
Actual Risk vs. Perceived Risk (IaS4.3)
• Actual (Statistical) Risk: The mathematically calculated probability of an event or adverse effect occurring in a large population over a specific period of time (e.g., 1 in 10,000 per year).
• Perceived Risk: How risky people feel an activity or technology is. People's feelings often differ widely from the statistical numbers.
Why Does Perceived Risk Differ from Actual Risk?
People are more or less willing to accept risks based on three main psychological factors:
1. Voluntary vs. Involuntary:
People are much more willing to accept risks they choose freely (e.g., smoking, skiing, driving fast) than risks imposed on them without choice (e.g., living near a chemical factory, living near an incinerator, food additives).
2. Familiar vs. Unfamiliar:
People tend to accept familiar everyday hazards (e.g., crossing a busy road, using a car) but overestimate the risk of unfamiliar, invisible, or high-tech hazards (e.g., nuclear radiation, nanomaterials, genetically modified foods).
3. Short-term/Reversible vs. Dread/Long-term Consequences:
People are more willing to accept minor, reversible harms (e.g., a sore arm from a vaccine) than risks associated with severe, irreversible, catastrophic, or fatal outcomes (e.g., plane crashes, cancer).
Memory Trick: Remember V-F-D — Voluntary, Familiar, Dread. These three factors explain why people react differently to risks!
Key Takeaway: Actual risk is a calculated mathematical probability; perceived risk is an emotional estimate influenced by whether a hazard is chosen voluntarily, familiar, or carries dreaded consequences.
---3. Weighing Up Risks and Benefits: Who Gains and Who Takes the Risk?
The "Zero Risk" Myth
In your exams, never say: "This technology should be banned because it is dangerous."
In science, no human activity or technology carries zero risk. Even drinking water or crossing a street has a tiny statistical risk. Decisions are made by balancing risks against benefits, not by expecting zero risk.
The Distribution of Risk and Benefit
Decision-making becomes controversial when the people who enjoy the benefits are not the same people who bear the risks:
• Power Stations and Landfill Sites: An entire city benefits from cheap electricity or waste disposal, but the local residents living right next to the facility bear the risks of traffic, noise, and potential pollution.
• Vaccines and Herd Immunity: An individual takes a tiny personal risk of a mild side effect, but the entire population benefits from stopping the spread of an infectious disease.
When answering exam questions on a proposed development, always ask yourself: Who gets the benefit? Who takes the risk? Is it fair?
Key Takeaway: Conflicts arise when benefits and risks are not shared equally among all groups involved.
---4. Context and Sustainability in Decision-Making (IaS4.4)
OCR Definition of Sustainability
Make sure you memorise this exact definition for the exam:
Sustainability: Using natural resources at the same rate as they can be naturally replaced or regenerated.
Context-Dependent Decisions
The right decision in one situation might be the wrong decision in another. Decisions depend on four key contexts:
• Personal Context: An individual's lifestyle, personal beliefs, or family medical history (e.g., choosing whether to have a genetic screening test).
• Social Context: Cultural norms, public trust, and ethical values of a community.
• Economic Context: Available money and resources. For example, a wealthy country can afford to build expensive offshore wind farms, while a developing nation might rely temporarily on cheaper fossil fuels to lift people out of poverty.
• Environmental Context: Geography and local ecosystems. Building a solar farm makes sense in a sunny desert, while building a geothermal plant makes sense in a volcanically active area like Iceland.
Key Takeaway: Different societies and individuals make different decisions because their personal, social, economic, and environmental circumstances differ.
---5. The Role and Limits of Science in Decision-Making
Science is incredibly powerful, but it has distinct boundaries:
What Science CAN Do:
• Measure data accurately and discover cause-and-effect mechanisms.
• Calculate the actual statistical risk of an event.
• Predict what is likely to happen if a specific action is taken.
• Develop new technologies to reduce or mitigate risks.
What Science CANNOT Do:
• Make moral, ethical, or value judgements.
• Decide what is "right" or "wrong".
• Pass laws or decide policy on its own.
Common Mistake to Avoid: Never write that "scientists decided to ban a chemical". Scientists collect evidence and calculate risks; governments, regulators, and society make the moral and political decisions to ban or permit technologies.
Key Takeaway: Science provides evidence and estimates risks, but human values, ethics, and politics determine what decisions are made.
---6. Quick Summary & Exam Checklist
Before sitting your exam, check that you can:
• Give examples of positive impacts and unintended risks in Biology, Chemistry, and Physics.
• Clearly state the difference between a hazard (potential to harm) and a risk (chance of harm under exposure).
• Explain the difference between actual risk (calculated chance) and perceived risk (how people feel).
• Name the three factors that alter perceived risk: voluntary vs. involuntary, familiar vs. unfamiliar, and short-term vs. dread/fatal outcomes.
• Define sustainability as using resources at the same rate as they can be naturally replaced or regenerated.
• Explain how personal, social, economic, and environmental contexts lead to different decisions.
• Explain that science provides evidence and probabilities, but cannot make moral or ethical value judgements.