19.3 Environmental policy and international agreements

Environmental policies and international agreements provide the frameworks that nations use to tackle shared problems like climate change, ozone depletion, and biodiversity loss. Without coordinated action across borders, individual countries acting alone can't solve environmental issues that affect the entire planet. This section covers the major international treaties, the laws that implement them at the national level, and the core principles that guide environmental policy-making.

International Environmental Agreements

Global Climate Change Agreements

Three key agreements form the backbone of international climate action. They build on each other chronologically, so understanding the progression helps.

United Nations Framework Convention on Climate Change (UNFCCC), adopted in 1992, is the foundation. It established the principle that nations should cooperate to combat climate change, but it didn't set binding emissions targets. A few things to know:

• Recognizes "common but differentiated responsibilities", meaning developed countries (which industrialized first and produced more historical emissions) bear a greater obligation to act than developing countries
• Holds an annual Conference of the Parties (COP) where nations assess progress and negotiate further commitments
• Nearly every country in the world has ratified it, making it one of the most widely adopted treaties

Kyoto Protocol, adopted in 1997, was the first agreement to set legally binding emissions reduction targets. It applied those targets only to developed countries (called Annex I Parties) across two commitment periods (2008–2012 and 2013–2020). It also introduced market-based mechanisms to help countries meet their goals:

• Emissions trading allows countries that exceed their targets to sell surplus allowances to countries that fall short
• The Clean Development Mechanism (CDM) lets developed countries earn credits by funding emissions-reducing projects in developing nations
• Joint Implementation (JI) allows developed countries to earn credits from projects in other developed countries

A significant limitation: the United States never ratified the Kyoto Protocol, and Canada withdrew in 2011, weakening its overall impact.

Paris Agreement, adopted in 2015, replaced the Kyoto approach with a more inclusive structure. Instead of top-down targets for only developed nations, every participating country submits its own nationally determined contributions (NDCs) outlining its emissions reduction plans.

• Aims to limit global warming to well below 2°C above pre-industrial levels, with an aspirational target of 1.5°C
• Includes provisions for climate finance and technology transfer to help developing countries transition to cleaner energy
• Countries are expected to ratchet up their ambitions over time, submitting updated NDCs every five years

Agreements on Ozone Layer Protection and Biodiversity Conservation

Montreal Protocol, adopted in 1987, is often called the most successful international environmental agreement ever. It phases out the production and consumption of ozone-depleting substances (ODS) like chlorofluorocarbons (CFCs) and hydrochlorofluorocarbons (HCFCs).

• It has achieved universal ratification, meaning every UN member state has signed on
• ODS emissions have dropped dramatically, and the ozone layer is projected to recover to 1980 levels by roughly the mid-21st century
• Later amendments accelerated phase-out schedules and added new substances. The Kigali Amendment (2016) extended the treaty to cover hydrofluorocarbons (HFCs), which are potent greenhouse gases

The Montreal Protocol's success is partly due to its clear targets, available substitute chemicals, and built-in financial support for developing countries through the Multilateral Fund.

Convention on Biological Diversity (CBD), adopted in 1992, addresses the conservation and sustainable use of biodiversity. It has three core objectives:

• Conserve biological diversity
• Promote sustainable use of its components
• Ensure fair and equitable sharing of benefits arising from genetic resources

Two supplementary protocols strengthen the CBD:

• The Cartagena Protocol on Biosafety (2000) regulates the transboundary movement of genetically modified organisms
• The Nagoya Protocol (2010) establishes rules for access to genetic resources and benefit-sharing with the countries and communities that provide them

Member countries develop national biodiversity strategies and action plans (NBSAPs) to implement the convention domestically.

Environmental Law and Legislation

National and International Environmental Legislation

Environmental legislation refers to laws enacted by national governments to protect the environment and public health. These laws cover air and water quality, waste management, biodiversity conservation, toxic substances, and more. Some prominent examples:

• Clean Air Act (United States) regulates air emissions from stationary and mobile sources
• Environmental Protection Act (United Kingdom) covers waste management, contaminated land, and pollution control
• Environment Protection and Biodiversity Conservation Act (Australia) provides a legal framework for protecting nationally significant species and ecosystems

Regulatory agencies enforce these laws. In the U.S., the Environmental Protection Agency (EPA) sets and enforces standards. In the EU, the European Environment Agency (EEA) monitors environmental conditions and informs policy, while enforcement happens through member state agencies and EU directives.

International environmental law operates at a higher level, governing relations between states on transboundary issues like climate change, ozone depletion, marine pollution, and biodiversity loss. It draws on treaties, conventions, and customary rules, and is implemented through organizations like the United Nations Environment Programme (UNEP) and the International Union for Conservation of Nature (IUCN). Three principles are central to this body of law: prevention of transboundary harm, the precautionary principle, and the polluter pays principle (both covered below).

Environmental Impact Assessment

An environmental impact assessment (EIA) is a systematic process for evaluating the likely environmental effects of a proposed project before it goes ahead. Many countries require EIAs by law for projects expected to have significant environmental consequences.

The EIA process generally follows these steps:

1. Screening determines whether a proposed project requires a full assessment
2. Scoping identifies which environmental, social, and economic impacts need to be studied
3. Impact analysis evaluates the potential positive and negative effects on the environment, human health, and local communities
4. Alternatives assessment considers different ways to achieve the project's goals, including the option of not proceeding at all
5. Mitigation planning proposes measures to avoid, reduce, or offset adverse impacts
6. Public participation gives affected communities and stakeholders the opportunity to review findings and provide input
7. Decision-making uses the EIA findings to approve, modify, or reject the project

Key legislation requiring EIAs includes the National Environmental Policy Act (NEPA) in the United States and the Environmental Impact Assessment Directive in the European Union. The emphasis on public participation and transparency is a defining feature of the EIA process.

Environmental Policy Principles

Precautionary Principle and Polluter Pays Principle

These two principles shape how governments approach environmental risk and responsibility.

Precautionary Principle: When an action or policy poses a suspected risk of harm to the public or the environment, the burden of proof falls on those proposing the action to demonstrate it is safe. In other words, you don't wait for absolute scientific certainty before taking protective measures.

• Formally recognized in the Rio Declaration on Environment and Development (1992) and the Cartagena Protocol on Biosafety (2000)
• Applied in contexts like the regulation of genetically modified organisms (GMOs), pesticide approvals, and chemical substance management
• The core idea: absence of proof of harm is not the same as proof of absence of harm. If there's reasonable suspicion of serious or irreversible damage, preventive action is justified

Polluter Pays Principle: Those responsible for causing pollution should bear the costs of prevention, control, and remediation. This principle aims to internalize external costs, meaning the environmental damage that would otherwise be paid for by society gets charged back to the polluter.

• Recognized in the Rio Declaration (1992) and implemented through the EU's Environmental Liability Directive (2004)
• Creates economic incentives for polluters to reduce emissions and adopt cleaner technologies
• Implemented through specific policy tools:
  • Carbon taxes charge emitters per ton of $CO_2$ released
  • Landfill taxes increase the cost of waste disposal, encouraging recycling
  • Tradable permits (cap-and-trade systems) set an overall emissions cap and let companies buy and sell allowances
  • Water pollution charges apply fees to industrial effluent discharges

Together, these principles push policy in a proactive direction: act before damage becomes irreversible, and make sure the people causing the damage pay for it.