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D4.3 Climate change

Climate change affects ecosystems through greenhouse-gas forcing, feedback cycles, habitat shifts, coral stress, phenology changes, and evolutionary responses across many environments.

Syllabus
First assessment 2025
Topic
D4.3
Level
—

What you’ll learn

12 learning objectives

Choose one objective for a focused lesson, or study the complete topic.

Exam analysis

An aggregate view of how the complete D4.3 Climate change appears across past papers.

Chance of appearing24%of analysed past papers
Latest appearanceNovember 2025
Most common paperPaper2

Most tested objectives

  1. D4.3.1—Anthropogenic causes31 questions
  2. D4.3.4—Polar habitat changes12 questions
  3. D4.3.7—Coral reef threats10 questions

Common question formats

  • Comparison
  • Data analysis
  • Definition or recall
  • Diagram interpretation
  • Evaluation
  • Extended response
  • Graph interpretation
  • Process explanation
  • Structured response

Exam question appearances

November 2025Paper1B ["HL"] · TZ34(e)[ 4 ]D4.3.2—Positive feedback cycles
November 2025Paper2 ["HL"] · TZ14(c)[ 2 ]D4.3.1—Anthropogenic causes
November 2025Paper1A ["HL"] · TZ339[ 1 ]D4.3.9 (HL)—Phenology
November 2025Paper1A ["SL"] · TZ130[ 1 ]D4.3.6—Range shifts
November 2025Paper1A ["SL"] · TZ329[ 1 ]D4.3.2—Positive feedback cycles
Practice this topic

5 original exam-style questions based on the patterns above.

Coverage 2010–2025 · Updated 16 Jul 2026

Study checklistD4.3 Climate change