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5.3.10Unit 5: Respiration, Internal Environment, Coordination and Gene Technology

Contentious Issues in Environmental Science — IAL Edexcel Linear Revision Notes & Topical Questions

5 min read 5 parts Lesson 24 of 36 Unit quiz

📚 IAL Edexcel Linear Hub / Topical Revision
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Curriculum Equation Key معادلة التنفس الخلوي الهوائي الموزونة - Balanced Cellular Respiration EquationFast Exam Solution
C₆H₁₂O₆ + 6O₂ ➔ 6CO₂ + 6H₂O + 36-38 ATP
Word Equation & Conditions: Glucose + Oxygen -> Carbon Dioxide + Water + Energy (36-38 ATP) | جلوكوز + أكسجين ← ثاني أكسيد كربون + ماء + طاقة
Location & Specifications: الميتوكوندريا (Mitochondria) والسيتوسول.
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Part 1 of 5Scientific Consensus

Most scientists agree on the main conclusions about climate change.

Agreement
  • Agreement There is a strong consensus that greenhouse gas concentrations are rising and cause warming.
Human cause
  • Human cause The consensus view is that human activities, mainly burning fossil fuels, are the main reason.
Dissent
  • Dissent A few individuals argue that natural factors, such as solar activity, explain the warming.
Testing claims
  • Testing claims Claims are judged by how well they fit all of the evidence, not by who makes them.
Public debate
  • Public debate Scientific agreement does not guarantee agreement in politics, where values and costs are also debated.

Part 2 of 5Evaluating Evidence

A careful evaluation follows a sequence of questions.

1
Does the statement take account of all of the available evidence, or only part of it?
2
Is the data reliable, from several independent studies, and are the results statistically significant?
3
Has the work been published in a peer-reviewed journal, so that other scientists have checked it?
4
Is the source free from bias, or does the author have a financial or political interest in the outcome?
5
A claim is more credible if other scientists can repeat the work and get similar results.

Part 3 of 5Why Issues Are Contentious

Why Issues Are Contentious
Uncertainty
  • Uncertainty Models contain assumptions, and predictions have ranges rather than single answers.
Economics
  • Economics Reducing emissions has costs, and countries disagree on who should pay.
Ethics
  • Ethics Decisions affect future generations and people in low-lying or poor regions.
Media
  • Media News reports may simplify results or give equal weight to unequal evidence.

Part 4 of 5Making Judgements

Correlation
  • Correlation A relationship in data does not prove cause, so look for a mechanism.
Mechanism
  • Mechanism Greenhouse gases absorb infrared radiation, which supplies a physical explanation.
Risk
  • Risk The precautionary principle supports action even when some uncertainty remains.
Balance
  • Balance A good answer states both the strengths and limitations of the evidence.

Part 5 of 5Exam Checklist & Tips

5.3.10 – Key Points for the Exam

  • Consensus A general agreement among most experts in a field.
  • Peer review Checking of a scientific report by independent experts before publication.
  • Bias Influence of personal, financial or political interests on a conclusion.
  • Reliability How consistently a result can be repeated.

Common Mistakes

  • Rejecting a result simply because of who produced it; judge the evidence.
  • Treating one outlier year as evidence against a long-term trend.
  • Saying that a model is useless because it contains uncertainty.
  • Confusing correlation with causation or ignoring the mechanism.

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