The nature of global environmental protection: HSC Legal Studies

What this dot point is asking

The nature of global environmental protection is the first part of the Global Environmental Protection option of the Legal Studies Stage 6 Syllabus (2009). This page covers three of its four dot points: the definition of global environmental protection, the development of global environmental law and the need for global environmental protection. The syllabus asks you to define global environmental protection, outline the development of global environmental law and outline the need for laws to protect the global environment. The fourth dot point, the importance of ecologically sustainable development, has its own page: ecologically sustainable development.

The option's principal focus is that "through the use of contemporary examples, students investigate the effectiveness of legal and non-legal processes in promoting and achieving environmental protection". Five themes and challenges run through every answer: the impact of state sovereignty on international cooperation and the resolution of conflict, compliance and non-compliance, changing values and ethical standards, the role of law reform and the effectiveness of legal and non-legal responses. This page gives you the vocabulary and history that every other page in the option builds on.

The answer

Defining global environmental protection

There is no single statutory definition, so you should build one from its parts:

• Global means the scale of the problem and of the response. Some environmental problems are global in nature (climate change, ozone depletion, loss of biodiversity, ocean plastics); others are transboundary (a river polluted upstream in one state and used downstream in another; smoke haze drifting across a border).
• Environment includes the air, water, land and living things, and the ecological processes that support life.
• Protection includes preventing harm, managing resources sustainably, restoring damaged ecosystems and compensating for harm.

A workable definition: global environmental protection is the use of legal and non-legal measures by states, international organisations, non-government organisations and individuals to protect the environment at a global scale, including the global commons and areas affected by transboundary harm, for present and future generations.

Three ideas explain why the environment is a legal problem at the global level:

1. The global commons. Some areas belong to no state: the atmosphere, the high seas beyond national jurisdiction, outer space and (by the Antarctic Treaty system) Antarctica. Ecologist Garrett Hardin's "tragedy of the commons" (1968) explains why shared resources are overused: each user gains the full benefit of taking more but shares the cost with everyone.
2. Transboundary harm. Pollution does not stop at a border, but the law of each state does.
3. Common concern of humankind. The preamble to the UN Framework Convention on Climate Change (1992) acknowledges that "change in the Earth's climate and its adverse effects are a common concern of humankind". This language signals that every state has an interest in the problem, even where the harm happens elsewhere.

The development of global environmental law

International environmental law has no single code or world parliament. It is made up of treaties (binding on the states that consent), customary international law (general state practice accepted as law, such as the duty to prevent significant transboundary harm), soft law (declarations and resolutions that are not binding but shape behaviour and later treaties) and decisions of courts and tribunals, which clarify the rules. Its history is one of reactive development: each stage followed evidence of harm and a change in community values.

Stockholm, 1972

The UN Conference on the Human Environment was the first major UN conference on the environment. Its declaration set out principles rather than binding rules. The most important for this option is Principle 21, which captures the central tension of the whole topic: states have "the sovereign right to exploit their own resources pursuant to their own environmental policies, and the responsibility to ensure that activities within their jurisdiction or control do not cause damage to the environment of other States or of areas beyond the limits of national jurisdiction". The UN General Assembly established UNEP later in 1972.

Rio, 1992

Twenty years later, the UN Conference on Environment and Development (the Earth Summit) adopted the Rio Declaration (27 principles, including the precautionary approach in Principle 15 and common but differentiated responsibilities in Principle 7), Agenda 21, and opened the UNFCCC and the Convention on Biological Diversity for signature. Australia ratified both, the UNFCCC on 30 December 1992 and the CBD on 18 June 1993. These are framework conventions: they set objectives and institutions, and later agreements (Kyoto, Paris, the biodiversity frameworks) supply the detail.

From Kyoto to Paris

The Kyoto Protocol set binding targets only for developed countries, and the United States never ratified it. The Paris Agreement (2015) changed approach: every party sets its own nationally determined contribution (NDC), updated every five years, reviewed through a transparency framework and a global stocktake. As at September 2026 the Agreement has 194 parties; the United States withdrew for the second time with effect from 27 January 2026.

The rights turn and the courts

In 2022 the UN General Assembly recognised the human right to a clean, healthy and sustainable environment (resolution 76/300, adopted 161 votes to none, with 8 abstentions). International courts then clarified the law: the International Tribunal for the Law of the Sea advised in May 2024 that greenhouse gas emissions are pollution of the marine environment under UNCLOS, and on 23 July 2025 the International Court of Justice unanimously advised that states have binding obligations under the climate treaties and customary law to protect the climate system (see courts, conferences, IGOs, NGOs and the media).

The oceans

The Agreement on Marine Biological Diversity of Areas beyond National Jurisdiction (the BBNJ Agreement or High Seas Treaty) was adopted in June 2023 and entered into force on 17 January 2026. It allows marine protected areas on the high seas, which cover most of the ocean and were previously largely unregulated. Australia signed in September 2023 and deposited its ratification on 23 September 2026, when the treaty had 100 parties.

The need for global environmental protection

The syllabus asks you to outline the need for laws to protect the global environment. There are two parts to the answer: the scale of the harm, and why law (not just goodwill) is needed.

The scale of the harm.

• Climate change. The World Meteorological Organization reported that 2024 was the warmest year on record and that 2025 was about 1.44°C above the 1850 to 1900 average, the second or third warmest year, with the past 11 years the 11 warmest on record. The UNEP Emissions Gap Report 2025 projected warming of 2.3 to 2.5°C this century even if all countries' NDCs are fully implemented, and up to 2.8°C under current policies.
• Biodiversity loss. The IPBES Global Assessment (2019) found around 1 million animal and plant species are threatened with extinction. Australia's State of the Environment 2021 report (released July 2022) found the overall state of the environment "poor and deteriorating", and that Australia has lost more mammal species than any other continent.
• Oceans and pollution. Ocean warming and acidification, overfishing and plastic pollution; the UN Environment Assembly agreed in March 2022 to negotiate a treaty to end plastic pollution, but talks have not yet produced a treaty.
• Ozone. The one success story: the Montreal Protocol phased out most ozone-depleting substances, and the ozone layer is on track to recover to 1980 levels by about 2066 over Antarctica.

Why law is needed.

• Borders. A state's law applies within its territory. Transboundary and global harm can only be managed by agreement between states.
• Free riders. Cutting emissions or protecting a species costs the state that does it, while the benefit is shared by all. Binding rules, transparency and reciprocity reduce the incentive to free ride.
• Market failure. Pollution is an externality: the polluter does not pay the full cost. Law prices or prohibits it.
• Future generations. People not yet born cannot vote or sue, so the law must build in intergenerational equity (see ecologically sustainable development).
• Justice between states. The states that emitted least, such as Pacific Island nations, face the worst harm from sea-level rise. The law allocates responsibility and, increasingly, finance and liability.

Changing values and ethical standards

The development of the law tracks a change in values. Early law treated the environment as a resource to be divided between states; the modern view treats it as a shared inheritance with value in itself, and increasingly as a human rights issue. Silent Spring (1962), the images of Earth from space, disasters such as the Chernobyl nuclear accident (1986), and in Australia the Franklin Dam campaign (1982 to 1983) and the Black Summer bushfires (2019 to 2020) all shifted public opinion. The youth-led school strikes from 2018 and the Pacific Islands Students Fighting Climate Change campaign, which led Vanuatu to seek the ICJ's advisory opinion, show values driving law reform. But values are contested: the United States' withdrawal from Paris (2026) and continuing fossil fuel approvals show that economic and political values still compete with environmental ones.

Is the law meeting the need?

Judgement. Global environmental law has developed significantly, from a few bilateral rules to a network of treaties, customary duties, institutions and court opinions. It is most effective where the problem is well defined and the solution is affordable, as the Montreal Protocol shows. It remains limited against climate change and biodiversity loss because it depends on the consent and compliance of sovereign states, which is the theme that runs through the rest of this option.

In one sentence

Global environmental protection is the legal and non-legal protection of an environment that crosses borders, and its law has grown reactively from Trail Smelter and Stockholm to Rio, Paris, the High Seas Treaty and the 2025 ICJ opinion because no state can protect the global commons alone, although the law still depends on the will of sovereign states.

Try this

Q1. Define global environmental protection. (3 marks)

• What the marker wants. Legal and non-legal measures; the global or transboundary scale; the global commons, with an example.

Q2. Outline the development of global environmental law. (5 marks)

• What the marker wants. A sequence from early bilateral rules (Trail Smelter) through Stockholm (1972), Rio (1992), Kyoto and Paris to recent developments (2022 right to a healthy environment, 2025 ICJ opinion, 2026 High Seas Treaty), showing change over time.

Q3. Explain the need for laws to protect the global environment. (6 marks)

• What the marker wants. Evidence of harm with a source (WMO, IPBES), and why law is needed: borders, free riders, externalities, future generations and justice between states.