Cambridge IGCSE Global Perspectives (0457): Topic: Environment, pollution and conservation — Study Guide

This guide is for the Cambridge IGCSE Global Perspectives (0457) syllabus for examination in 2025, 2026 and 2027, Version 2 (published April 2025). “Environment, pollution and conservation” is one of the 22 topics in the topic list in section 3, and that list is used for all three components: Component 1 Written Exam, Component 2 Individual Report and Component 3 Team Project. The syllabus states that knowledge of content is not assessed. So this page does not ask you to learn facts about pollution or wildlife. It shows you how to use the topic to practise the assessed skills described in sections 2 and 4.

Start from the Global Perspectives hub and track your skills on the 0457 checklist. For a fast recap use the environment revision notes, then try the environment practice questions.

Coverage table

Syllabus reference	What you must be able to do (from the document)	Where assessed
Section 2, AO1 Research, analysis and evaluation	Research global issues, their causes, consequences and possible courses of action; use evidence to support claims; analyse and evaluate evidence, reasoning and sources; develop a line of reasoning	Components 1, 2 and 3
Section 2, AO2 Reflection	Consider different perspectives objectively and with empathy; justify your own perspective with evidence and reasoning; reflect on how research and teamwork changed your learning	Components 2 and 3 (0% of Component 1)
Section 2, AO3 Communication and collaboration	Present arguments, evidence and perspectives clearly and with structure; include citations and references; contribute to the Team Project	Components 2 and 3
Section 3, topic list and key terms	Use a topic to explore global issues; understand issue, perspective, research, evidence and argument as the syllabus defines them	All components
Section 4, Component 1	Analyse information, arguments and perspectives in sources; evaluate research and suggest how to test a claim; judge the quality of arguments; assess actions. Understand bias, claim, fact, generalisation, opinion, prediction, value and vested interest; analyse use of evidence and language	Written Exam
Section 4, Component 2	Choose an issue that divides opinion; devise a global research question; include local and/or national and global perspectives; analyse causes and consequences; propose one course of action; evaluate sources	Individual Report
Section 4, Component 3	Identify a local issue; research different perspectives; plan, carry out and measure an action; reflect on learning and teamwork	Team Project

Using the topic, not learning it

The syllabus defines an issue as “an important subject or problem for discussion” and a perspective as “a viewpoint on an issue based on evidence and reasoning”. “The environment” is not an issue. It is a broad area that holds many issues.

To find an issue, look for a question that people disagree about. “What is pollution?” is not an issue. “Should a factory that pollutes a river be closed if it is the town’s main employer?” is. The syllabus says the Individual Report issue “should be one that divides opinion”, so build this habit early.

Key working definitions (ours, not the syllabus’s):

• Pollution: harmful substances, noise, light or heat released into air, water or land by human activity.
• Conservation: protecting habitats, species and natural resources so they last.
• Biodiversity: the variety of living things in a place.
• Sustainability: meeting present needs without damaging the ability of future people to meet theirs. The syllabus says any topic “can be considered with a focus on sustainability”, which fits this topic well.

Issues at global, national and local level

Component 1 sources present perspectives that are “personal, local and/or national, global”. The Individual Report needs local and/or national and global perspectives. The Team Project starts from “a local issue”. So practise seeing each environmental issue at more than one level.

Level	Example issues within this topic
Global	Whether rich countries should pay poorer ones to protect forests and wildlife; how to control pollution that crosses borders; whether the international trade in wild animals and plants should be banned or managed
National	How strict pollution limits should be when industry provides jobs; whether to create national parks where people already live and farm; who pays to clean up old industrial sites
Local	Noise or light from a new development; waste dumped in a local green space; whether a wetland should be drained for housing

Real examples show how one issue moves between levels:

• The Montreal Protocol (1987). Countries agreed to phase out chemicals that damage the ozone layer. It has been ratified by every UN member state. Strength as an example: it shows a global problem solved by global action. Limitation: some replacement chemicals (HFCs) turned out to be strong greenhouse gases, which led to the Kigali Amendment in 2016. A solution can create a new problem.
• Minamata, Japan. Mercury in factory wastewater poisoned fish in Minamata Bay, and people who ate the fish became seriously ill; the disease was officially identified in 1956. A local disaster later gave its name to a global treaty, the Minamata Convention on Mercury (adopted 2013). Evaluation point: it shows local evidence driving global action, but it took decades.
• CITES (1973). The Convention on International Trade in Endangered Species of Wild Fauna and Flora controls cross-border trade in listed species. Limitation: it depends on each country enforcing it, so illegal trade can continue where enforcement is weak.

Worked example (analysis of levels): “At a global level, mercury pollution is an issue because it travels through air and water and builds up in fish eaten across the world. At a national level, the question is how tightly a government should regulate industries that release mercury. At a local level, it is about whether a community can safely eat fish from its own bay. Linking these levels shows why a local problem may need action far beyond the place where it starts.”

Perspectives: who thinks what, and why

AO2 asks you to “consider different perspectives objectively and with empathy”. The Individual Report section says candidates should show “why different people have different perspectives”. So do not just list views. Explain the reasons behind each.

Group	Typical perspective on a new protected area	Why they might hold it
Local people who farm, fish or graze there	Worried about losing land, income or traditional rights	Their livelihood depends on using the area now
Conservation organisations	Supportive; may want stricter rules	Their aim is protecting species and habitats
National government	Mixed: wants international credit and tourism income, but also jobs and votes	Must balance several groups
Tourism businesses	Often supportive	Wildlife and scenery attract visitors
International bodies	Supportive of targets	The Kunming-Montreal Global Biodiversity Framework (2022) set a target to conserve 30% of land and sea by 2030

Notice that a perspective is not the same as a group. Two fishers can hold different perspectives. Avoid saying “farmers think…” as if every farmer agrees.

Worked example (perspective with empathy): “A herder who opposes a new reserve is not simply ‘against nature’. If the reserve removes the grazing land her family has used for generations, her opposition rests on a reasonable concern about food and income. A strong report would take that concern seriously while also weighing the evidence that overgrazing is harming the habitat.”

Causes and consequences

The aims include developing “an analytical and evaluative grasp of global issues and their causes and consequences”. The Individual Report says causes and consequences should be “presented and analysed in depth”.

Analysis means showing chains, not lists. Compare:

• List (weak): “Causes of river pollution are factories, farms and sewage.”
• Chain (strong): “Cheap production for export encourages factories to cut costs. Treating wastewater is expensive, so some discharge it untreated where enforcement is weak. Fish stocks fall, which hits the income of fishing families downstream.”

Sort consequences by who and where they affect: environmental, economic, social and health consequences; short term and long term; local and global. Also look for trade-offs: a consequence that is bad for one group may be good for another. Closing a polluting factory helps people downstream but costs workers their jobs.

Judging sources and evidence

Component 1 says you “will benefit from an understanding of” eight terms. Here they are with examples from this topic. The examples are invented.

Term	What it means	Example
Fact	A statement that can be checked against evidence	“The reserve covers 120 square kilometres.”
Opinion	A personal view that cannot be proved true or false	“The reserve is a waste of good farmland.”
Claim	A statement presented as true that may or may not be supported	“Banning cars from the park will save its birds.”
Prediction	A statement about what will happen	“Without action the lake will be lifeless in ten years.”
Generalisation	A broad statement applied to all cases from a few	“Tourists always leave litter.”
Value	A belief about what matters or is right	“Nature has a right to exist for its own sake.”
Bias	A one-sided presentation that leaves out or distorts	A report on a mine that mentions only the jobs it creates
Vested interest	Something a source gains or loses from the outcome	A logging company writing about forest protection

You must also “analyse and evaluate use of evidence and language”. On this topic, watch for emotive words (“poisoning”, “destroying”, “eco-extremists”) and for numbers with no source, date or sample.

To judge reliability, ask:

1. Who produced it, and do they have expertise or a vested interest?
2. How was the evidence gathered: sample size, time period, method?
3. When: is it recent enough for the claim?
4. Does the evidence support the conclusion, or does the source claim more than it shows?
5. Do other sources agree?

A vested interest does not make a source wrong. It means you should check whether its evidence is selective. A charity and a company can both be accurate, and both can be biased.

Worked example (evaluating evidence): An invented survey says, “80% of residents of Fenmoor want the wetland protected.” Knowledge: this is a claim backed by a statistic. Application: the survey was run by a wetland charity and only 50 people replied, all through its own newsletter. Analysis: newsletter readers are likely to support the charity already, so the sample is self-selected and small. Evaluation: the figure may show strong support among existing supporters, but it cannot show what Fenmoor as a whole thinks. A random survey of households would test the claim more fairly.

Courses of action and their effects

Component 1 Question 4 asks you to “assess actions in response to the global issue”. The Individual Report must consider “different possible courses of action” and propose a single one, explaining “how it could be implemented and what its impact would be”.

Types of action on this topic:

• International agreements (treaties, trade controls, funding for conservation)
• National laws and limits (emission limits, fines, protected areas, bans on certain products)
• Market tools (taxes on polluters, deposit-return schemes, eco-labels)
• Local and community action (clean-ups, monitoring, campaigns, community-run reserves)
• Individual choices (what people buy, use and throw away)

Judge each action against clear criteria: effectiveness (does it tackle the cause?), feasibility (cost, time, who must agree), fairness (who pays and who benefits?), sustainability (will it last?) and unintended consequences.

Worked example (assessing an action): “A national ban on single-use bags tackles one visible source of waste and is simple to enforce in shops. However, it does nothing about other plastics, and if shoppers switch to thicker bags used only once, the benefit falls. It is most effective alongside reusable alternatives that poorer households can afford. Overall, a ban works best as one part of a wider plan, not as the whole plan.”

Individual Report ideas

The Individual Report is a structured essay of 1500–2000 words with your own global research question as its title. The issue “should be one that divides opinion” and you need local and/or national and global perspectives. Example questions to adapt (not copy):

• Should protecting endangered species come before the needs of people who live alongside them?
• Should countries that import goods be responsible for pollution caused where those goods are made?
• Is trophy hunting ever justified as a way of paying for conservation?
• Should governments ban products that cause pollution, or tax them?

Check your question: is it open, global, debatable, and narrow enough for 2000 words? Then plan perspectives at each level, causes and consequences, several courses of action, one chosen action, source evaluation and your own reflective conclusion. See the Individual Report guide and Individual Report practice.

Team Project ideas

The Team Project begins with “a local issue”. The team plans and carries out an action and must “measure the success” of it. Local issues on this topic that suit a school team:

• Too much waste going to landfill from your school
• Noise or light pollution affecting a nearby green space
• Loss of habitat for birds or insects on school grounds
• Low awareness of how to dispose of batteries or electrical items safely

Choose an action you can actually carry out and measure: a count before and after, a short survey, a weight of waste. Evidence of Action can be posters, leaflets, web pages, videos (10 minutes maximum), presentations or photographs of an event; it “should not include evidence of research or initial meetings”. See the Team Project guide and Team Project practice.

Common errors

• Writing facts about the environment instead of analysing an issue. Knowledge of content is not assessed.
• Treating “pollution” or “conservation” as the issue, when it is only the topic.
• Calling a source biased because of who wrote it, without showing what it leaves out or distorts.
• Listing causes without linking them into chains.
• Showing only two sides (environment versus jobs) when there are more perspectives within each side.
• Proposing an action with no plan for how it would happen, who pays, or how success is measured.
• In the Team Project, choosing a global action (for example, “stop climate change”) that the team cannot carry out locally.
• In Component 1, using outside knowledge instead of the sources. Candidates are “not assessed on their prior knowledge”.

Where to go next

• Written Exam guide for how Component 1 works
• Global Perspectives revision notes and practice
• Individual Report revision notes and Team Project revision notes
• The related topic Climate change, energy and resources
• This unit’s revision notes and practice questions

Official syllabus

Cambridge IGCSE Global Perspectives (0457) syllabus for examination in 2025, 2026 and 2027, Version 2 (published April 2025), sections 2, 3 and 4. Your teacher will confirm which topics your class studies and how your coursework is scheduled.