Science and Society's Big Challenges

Climate, pandemics, food, technology — the defining challenges of our time are all bound up with science. But they are not only scientific; they involve values, trade-offs, and politics. Scientific thinking is essential for facing them well, and equally essential is knowing what science can and cannot decide.

This module applies everything the subject has taught to real-world challenges, non-partisanly. This opening lesson sets the ground rules.

Facts and values are different questions

Science can tell us what is and what is likely — how a virus spreads, how fast the climate is warming. It cannot, by itself, tell us what we ought to do, because that depends on values: how we weigh costs, risks, freedom, fairness, and future generations. Confusing the two — treating a value choice as if science settled it, or dismissing science because we dislike a policy — is a core error this lesson guards against.

Evidence-informed, not evidence-dictated

Good decisions are evidence-informed: they take the best available science seriously as an input, then combine it with values and trade-offs. Science narrows the options and reveals consequences; people and institutions still have to choose.

Consensus and assessment

On complex issues, no single study is decisive. Societies rely on assessment bodies that synthesise thousands of studies into an overall picture — reporting both what is well established and what remains uncertain. Understanding how scientific consensus forms helps you weigh claims responsibly.

Suppose science shows a policy would cut a health risk by half but at significant cost. Science supplies the numbers — the risk reduction, the cost, the uncertainties. Whether the trade-off is worth it depends on how a society values the risk against the cost. The science is necessary but not sufficient; pretending otherwise hides the real, value-laden choice.

Two opposite errors appear constantly. One is scientism — claiming science alone dictates a policy, smuggling values in under a lab coat. The other is denial — rejecting solid evidence because its implications are inconvenient. Both collapse the fact/value distinction from different sides. The scientific thinker holds them apart: take the evidence seriously and debate the values openly.

The Intergovernmental Panel on Climate Change (IPCC), established in 1988, is a useful model of how science informs big challenges. It does not conduct new experiments; instead, hundreds of scientists volunteer to assess and synthesise the published research, producing periodic reports that state findings with explicit confidence levels — distinguishing what is virtually certain from what remains uncertain. Crucially, the IPCC is designed to be "policy-relevant but not policy-prescriptive": it lays out the science and the consequences of different paths, but leaves the value-laden choices to governments and citizens. Whatever one's politics, the structure illustrates the healthy division of labour: science assesses reality and consequences; society decides what to do about them.

• "Science tells us what we should do." It informs decisions but cannot settle value questions.
• "If experts disagree, the science is worthless." Disagreement at the frontier coexists with strong consensus elsewhere.
• "One study proves it." Big issues rest on synthesised bodies of evidence, not single papers.
• "Taking science seriously means one particular policy." People who accept the same facts can favour different policies based on values.

Take a current science-related issue. Write down the factual questions (what science can inform) and the value questions (what people must decide) separately. Notice how often debates blur the two.

Think Like a Maester: Let science tell you what is and what would follow — then decide, openly, what you value.

1. What is the difference between a factual and a value question?
2. What does 'evidence-informed' mean?
3. Why do societies rely on assessment bodies for big issues?
4. What are scientism and denial, and how do they both err?
5. What does 'policy-relevant but not policy-prescriptive' mean?

Society's big challenges are part scientific and part value-laden. Science can tell us what is and what would follow, but not what we ought to do — that requires weighing values and trade-offs. Good decisions are evidence-informed, and complex issues rest on synthesised bodies of evidence, as the IPCC illustrates by assessing science while leaving choices to society. The scientific thinker keeps facts and values distinct, avoiding both scientism and denial.

• Science and Society
• Climate, Energy, and Hard Choices