Before the Flood (2016): Leonardo DiCaprio's look at climate impacts.
Earth Day (from 1970): a global campaign for environmental education and policy.
Disasters: Tipping Points That Forced Reform
Disasters expose environmental negligence and the cost of poor management.
They drive policy reform, regulation and international cooperation on safety.
The Chernobyl Nuclear Disaster (1986)
An explosion at Reactor 4 in Ukraine released radioactive dust across much of Europe.
It contaminated over 2,600 km2 of land and forced 336,000 people to evacuate.
It caused long-term health problems, including raised rates of thyroid cancer.
It exposed the risks of nuclear energy and led to tighter safety rules and public scepticism.
Note
Chernobyl shifted global energy policy.
Countries like Germany later phased out nuclear energy and invested in renewables.
Other Significant Events
Minamata Bay (Japan, 1956): methylmercury poisoning caused neurological disease and birth defects.
Bhopal (India, 1984): a release of methyl isocyanate gas killed thousands and spurred industrial safety reform.
Fukushima Daiichi (Japan, 2011): a tsunami-triggered meltdown reignited debate on nuclear risk.
Peru oil spill (2022): 12,000 barrels leaked into marine reserves, showing modern risks to biodiversity.
International Agreements: Turning Concern Into Governance
Global summits and treaties formalise commitments to sustainability and create a framework for governance.
They guide national policy, promote sustainable practice and hold nations accountable.
The Rio Earth Summit (1992)
Held in Rio de Janeiro, attended by 172 nations and coordinated by the UN.
It produced Agenda 21, a global plan for sustainable development.
It produced the Rio Declaration and the frameworks that became the UNFCCC and the Convention on Biological Diversity.
It laid the ground for the Kyoto Protocol (1997) and the Paris Agreement (2015).
Note
Rio was the first time global leaders publicly recognised that economic growth must align with ecological balance.
Other Agreements and Conferences
Stockholm Conference (1972): the first UN environmental summit.
Kyoto Protocol (1997): legally bound nations to cut greenhouse gas emissions.
Rio+20 (2012): renewed commitment and led to the Sustainable Development Goals.
COP27 (2022): established the Loss and Damage Fund for vulnerable nations.
COP28 (2023, Dubai): the first global deal to transition away from fossil fuels.
Tip
Memorise the key outcomes of Rio (1992) and Paris (2015).
Both are high-frequency examples in Paper 2 essays.
Technology: A Double-Edged Driver
Technological innovation can both cause and solve environmental problems.
Recent advances have reshaped how the movement approaches energy, food and pollution.
The Green Revolution (1940s to 1960s)
A period of rapid farming innovation: high-yield crops, synthetic fertilisers and irrigation.
It raised food supply and prevented famine in many developing countries.
It also caused soil degradation, biodiversity loss, fertiliser overuse and water contamination.
It sparked debate about sustainable intensification and agroecology.
Note
The Green Revolution shows technology can meet an immediate need like food security.
It often creates long-term ecological costs at the same time.
Other Technological Influences
Electric vehicles: cut carbon emissions and fossil-fuel dependence.
Plant-based meats: reduce agricultural land and water use.
Reduced enteric fermentation: feed changes cut methane from livestock.
Renewable energy (solar, wind, geothermal): central to climate mitigation.
Scientific Discoveries: The Evidence Base for Policy
Scientific research provides the evidence behind environmental policy and activism.
Discoveries about pollution, ecosystems and climate have transformed how we understand sustainability.
Pesticide Toxicity and Biodiversity Loss
Rachel Carson and later ecologists revealed the toxicity of pesticides like DDT to wildlife.
They showed chemicals bioaccumulate through food chains, harming birds, fish and humans.
The IPBES reported in 2019 that one million species face extinction from human activity.
These findings pushed governments to expand protected areas and biodiversity targets.
Tip
Use biodiversity loss as an example of scientific evidence driving global policy, such as the CBD and IPBES reports.
Other Key Discoveries
Climate change science: IPCC reports linked fossil fuel use to global temperature rise.
Ocean acidification: rising CO2 lowers marine pH, harming coral reefs and shellfish.
Ecosystem services: research showed ecological stability underpins economic and social health.
How the Drivers Connect
Individuals raise awareness and inspire collective action.
Literature and media spread environmental consciousness worldwide.
Disasters expose the cost of industrial progress.
International agreements institutionalise sustainability.
Technology can both solve and create problems.
Scientific discoveries provide the evidence that drives policy.
Together they turned environmentalism from isolated conservation efforts into a global, interdisciplinary movement uniting science, ethics and politics.
Active recall
Define the environmental movement and state two of its main goals.
How did Wangari Maathai's Green Belt Movement contribute to environmental awareness?
Why is Rachel Carson's Silent Spring seen as a turning point for the movement?
Name two outcomes of the Rio Earth Summit (1992).
Explain how the Green Revolution both helped and harmed the environment.
Give one example of scientific evidence that directly shaped conservation policy.