Core ideas and debates
Each area is a debate. Open it for the question, where the traditions agree, and where they divide. This is the raw material of every essay.
Human Nature›
The debate: Are humans equal members of nature, stewards of it, or trapped in human-on-human hierarchies?
Where they agree
All three strands reject the mainstream anthropocentric view that humans are above nature and that nature is a commodity for human exploitation. All accept that the existing materialist consumerist worldview must change. All take a holistic approach (Carson) to understanding humanity's place in the natural world, even if they disagree about exactly what that means.
Where they differ
Three distinct positions. Deep ecology takes a biocentric or ecocentric view - humans are one species among many, no more important (Leopold). Shallow ecology takes enlightened anthropocentrism - humans are part of nature and must be its stewards but human flourishing is still a legitimate goal (Carson). Social ecology rejects both: the issue is not humanity versus nature but human-on-human hierarchy (Bookchin). The 2024 mark scheme calls these 'deep divisions about the world view that should replace anthropocentrism.'
The State›
The debate: Reform the existing state, replace it with bioregional communes, or both?
Where they agree
All three strands believe the existing state structure must accept the limits to growth and promote sustainability. All reject the state's existing focus on GDP and economic growth. All believe the current state cannot continue with business as usual.
Where they differ
Shallow greens believe the existing state can be reformed to address ecological problems through regulation, taxation and investment (Carson, green capitalism). Deep greens argue the state is too rooted in anthropocentrism and industrialism to be reformed, and must be radically overhauled. Social ecology wants the state replaced with decentralised, federated bioregional communes (Bookchin). The 2023 mark scheme treats this as a fundamental divide: 'whether the state is part of the problem or part of the solution.'
The Economy›
The debate: Green capitalism, zero-growth steady state, or small-scale local production?
Where they agree
All three strands reject materialism and consumerism. All accept the principle of Limits to Growth - the planet cannot sustain unlimited exponential growth. All argue for some form of sustainability, even though they disagree on whether weak or strong. The 2020 mark scheme: 'most ecologists argue for sustainable economies' is itself a point of agreement.
Where they differ
Shallow greens believe capitalism is compatible with ecologism - green capitalism, weak sustainability, smarter slower greener growth (Carson). Deep greens reject capitalism and economic growth altogether: zero growth or degrowth, steady-state economy, strong sustainability (Schumacher). Social ecology rejects capitalism for small-scale local production based on common ownership and mutual aid (Bookchin). The 2024 mark scheme calls this a 'fundamental division': deep and social ecology support strong sustainability outside capitalism; shallow greens favour shallow sustainability supported by green capitalism.
Society›
The debate: Greener consumer society, ecocentric transformation, or decentralised communes?
Where they agree
All three reject the mainstream materialist consumerist society. All reject the mechanistic world view (Merchant) that treats nature as a machine to be exploited. All accept the lessons of ecology and call for a change in values, even though they disagree about what those values should be and how radical the change has to be.
Where they differ
Three approaches to social transformation. Deep ecology wants society remade around ecocentric values, with humans as one part of the biotic community (Leopold). Shallow ecology wants reform within the existing framework - green consumerism, renewable energy, recycling. Social ecology wants society remade around decentralised bioregional communes, free of all hierarchical relationships (Bookchin). The 2025 and 2023 mock mark schemes both treat this as a fundamental divide.
Ecology›
The debate: How deeply should the study of human-nature relationships reshape politics?
Where they agree
All strands take ecology as a politically loaded study of human-nature relationships. All accept the implications stretch into the state, society and the economy. The 9PL0 spec captures the shared starting point in the definition of ecology itself.
Where they differ
Deep ecology is ecocentric: non-human nature has intrinsic value (Leopold, Carson). Shallow ecology is enlightened anthropocentric: protect nature because it serves humans. Social ecology and its subtypes (eco-socialism, eco-anarchism, eco-feminism) trace the ecological crisis to human-on-human hierarchies (Bookchin, Merchant). The 9PL0 spec stages the divide as deep/shallow plus a third social-structural family.
Holism›
The debate: Does the mechanistic post-Enlightenment view of nature need to be replaced with a holistic one?
Where they agree
Most strands reject the strongest version of the mechanistic worldview. The 9PL0 spec presents holism as opposition to 'the mechanistic world view of post-Enlightenment science.' Even shallow ecology acknowledges interconnection - it just declines the call to replace the underlying frame.
Where they differ
Holism is central to deep ecology - the mechanistic worldview must be replaced (Carson, Leopold). Social ecology extends holism across nature and society, with hierarchy as the broken link (Bookchin, Merchant). Shallow ecology accepts limited interconnection but keeps the post-Enlightenment scientific frame and manages outcomes within it.
Environmental ethics›
The debate: How far should moral standing extend - humans only, all life, or the whole ecosystem?
Where they agree
All strands accept that environmental ethics must develop beyond narrow self-interest. The 9PL0 spec: 'developing new moral standards and values for human relations with each other and the non-human world.' The shared starting point is that current ethics are insufficient.
Where they differ
Deep ecology extends moral standing to all life and the ecosystem (biocentric equality, Leopold's land ethic). Shallow ecology keeps it anthropocentric - nature has instrumental value. Social ecology extends ethics to nature and across human oppressions, with the two linked (Bookchin, Merchant).
Environmental consciousness›
The debate: Does ending the ecological crisis require a radical change in human consciousness and identity?
Where they agree
Deep green and social ecology both call for some change in consciousness as part of the response. Shallow ecology rejects this. The 9PL0 spec lists environmental consciousness as a core idea; the disagreement is whether it is essential or replaceable by policy.
Where they differ
Environmental consciousness is the heart of deep ecology - sense of self realised through identification with nature. Shallow ecology says policy and technology can deliver greener outcomes without inner change. Social ecology calls for consciousness change but tied to social transformation (Bookchin), not purely inner.
Post-materialism and anti-consumerism›
The debate: Must we move beyond materialism and consumerism - or can capitalism be greened?
Where they agree
Most strands accept some critique of pure materialism. The 9PL0 spec lists post-materialism among the core ideas. Even shallow ecology accepts externalities have to be priced - the disagreement is whether the consumer model itself must go.
Where they differ
Deep ecology rejects consumerism as the goal of life (Schumacher's Buddhist economics). Social ecology subtypes read consumerism as symptomatic of capitalism (eco-socialism), state-hierarchy (eco-anarchism) or patriarchy (eco-feminism). Shallow ecology is cool: green capitalism can keep consumer society running with cleaner production.
Sustainability›
The debate: Strong sustainability (limits to growth) or weak sustainability (managed capitalism)?
Where they agree
All strands accept sustainability as the goal. The 9PL0 spec: 'the capacity of the ecological system to maintain its health over time.' The shared starting point is real; the disagreement is how strong sustainability needs to be.
Where they differ
Strong sustainability against weak sustainability. Deep ecology calls for hard limits to growth and rejects substitution by technology. Social ecology and its subtypes link sustainability to radical social change (Bookchin). Shallow ecology relies on technology and substitution within continued growth. The 9PL0 spec pairs deep green with strong sustainability and shallow green with weak sustainability.