IB Philosophy 9.2.1 Environmental Challenges and Degradation Notes

The Scale of Environmental Crisis

1. Unit 9 examines philosophy and contemporary issues. This section turns from technology (9.1) to the natural environment, asking whether humans have a moral obligation to protect nature and how the pursuit of "progress" relates to environmental destruction.
   1. These questions are among the most urgent philosophical challenges of the Anthropocene (the current geological era defined by humanity's outsized impact on the planet).
2. The depletion of natural resources represents one dimension of environmental crisis. Fossil fuels, fresh water, arable land, minerals, and forests are being consumed at rates that exceed the Earth's capacity to replenish them.
   1. This overconsumption threatens the material foundations on which human civilisation depends.
3. Pollution transforms the natural environment into a repository for human waste. Air pollution, water contamination, plastic accumulation in oceans, and the dispersal of toxic chemicals through ecosystems cause widespread harm to biodiversity and human health.
   1. Pollution is not a localised problem but a global systemic phenomenon.
4. Climate change is the most comprehensive environmental challenge. The accumulation of greenhouse gases from burning fossil fuels is altering the Earth's climate system, producing rising temperatures, extreme weather events, sea-level rise, and disruption of agricultural systems.
   1. The scientific consensus is that human activity is the primary driver of these changes.
5. Species extinction is occurring at rates estimated to be 1,000 times the natural background rate. Habitat destruction, pollution, climate change, and overexploitation are driving what scientists call the sixth mass extinction event in Earth's history.
   1. Unlike previous extinction events (caused by asteroid impacts or volcanic activity), this one is caused by a single species: humans.

Systemic Interconnection and Philosophical Stakes

1. These challenges are interconnected. Resource depletion drives the exploitation of new territories, which causes habitat destruction, which accelerates extinction, which weakens ecosystems, which reduces their capacity to regulate climate and provide resources.
   1. The environmental crisis is not a collection of separate problems but a systemic failure of the relationship between human civilisation and the natural world.
2. The philosophical significance of environmental degradation lies in the questions it raises about human responsibility. If human activity is causing irreversible damage to the conditions of life on Earth, are humans morally obligated to change course?
   1. A new ethics that includes obligations to nature, future generations, and other species may be required.
3. The concept of planetary boundaries (developed by Johan Rockstrom and colleagues in 2009) identifies nine Earth-system processes that regulate the stability of the planet. Several of these boundaries have already been crossed.
   1. Biodiversity loss has blown past the safe limit: current extinction rates are estimated at roughly 1,000 times the natural background rate. The nitrogen cycle has been disrupted by industrial agriculture at a scale that threatens freshwater systems globally.
   2. This scientific framework gives philosophical urgency to questions about environmental obligation.

Nature as an Object of Exploitation

1. The treatment of nature as an object of exploitation has deep roots in Western philosophical and religious traditions. Francis Bacon articulated the project of modern science as the mastery of nature: knowledge is power, and the purpose of investigating nature is to bend it to human purposes.
2. René Descartes deepened this attitude with his view that nature is a machine governed by mathematical laws. On this view, nature has no inner purpose or soul; it is just matter in motion. That meant nature had no value in itself and could be treated as raw material for humans to use.