A war in which the main participants are within the same state, such as the government and a rebel group.
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terrorism
The use or threatened use of violence against noncombatant targets by individuals or nonstate groups for political ends.
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asymmetrical warfare
Armed conflict between actors with highly unequal military capabilities, such as when rebel groups or terrorists fight strong states.
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separatist
An actor that seeks to create an independent state on territory carved from an existing state.
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irredentist
An actor that seeks to detach a region from one country and attach it to another, usually because of shared ethnic or religious ties.
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proxy wars
Conflicts in which two opposing states “fight” by supporting opposite sides in a war, such as the government and rebels in a third state.
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insurgency
A military strategy in which small, often lightly armed units engage in hit-and-run attacks against military, government, and civilian targets.
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extremists
Actors whose interests are not widely shared by others; individuals or groups that are politically weak relative to the demands they make.
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coercion
A strategy of imposing or threatening to impose costs on other actors in order to induce a change in their behavior.
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provocation
A strategy of terrorist attacks intended to provoke the target government into making a disproportionate response that alienates moderates in the terrorists’ home society or in other sympathetic audiences.
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spoiling
A strategy of terrorist attacks intended to sabotage a prospective peace between the target and moderate leadership from the terrorists’ home society.
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outbidding
A strategy of terrorist attacks designed to demonstrate superior capability and commitment relative to other groups devoted to the same cause.
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global climate change
Human-induced change in the environment, especially from the emissions of greenhouse gases, leading to higher temperatures around the globe.
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United Nations Framework Convention on Climate Change (UNFCCC)
An international agreement enacted in 1992, and entered into force in 1994, that provides an overall framework for intergovernmental efforts on climate change.
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Paris Agreement
An agreement negotiated under the UNFCCC in 2015, signed by 197 countries, and entered into force in 2016. It was the first agreement to require commitments for the control of greenhouse gas emissions from all signatories.
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tragedy of the commons
A problem that occurs when a resource is open to all, without limit. No one has an incentive to conserve, because others would use the resource in the meantime, so the resource suffers degradation.
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public goods
Products that are nonexcludable and nonrival in consumption, such as clean air or water.
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common-pool resources
Goods that are available to everyone, but such that one user’s consumption of the good reduces the amount available for others. Common-pool resources are rival but nonexcludable.
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nonexcludable goods
Goods that, if available to be consumed by one actor, cannot be prevented from being consumed by other actors as well.
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nonrival goods
Goods for which consumption by one actor does not diminish the quantity available for others.
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Kyoto Protocol
An amendment to the UN Framework Convention on Climate Change, adopted in 1997 and entered into force in 2005, that established specific targets for reducing emissions of carbon and five other greenhouse gases through 2020.
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Vienna Convention
A framework convention adopted in 1985 to regulate activities, especially emissions of CFCs, that damage the ozone layer.
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Montreal Protocol
An international treaty, signed in 1987, that is designed to protect the ozone layer by phasing out the production of a number of CFCs and other chemical compounds.
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cap-and-trade system
A cap-and-trade system sets limits on emissions, which are then lowered over time to reduce pollutants released into the atmosphere. Firms can sell “credits” when they emit less than their allocation or must buy from others when they emit more than their allocation.
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Nationally Determined Contribution (NDC)
The commitment each party to the Paris Agreement makes as to how they will contribute to reducing the threat of global warming.
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externalities
Costs or benefits for stakeholders other than the actor undertaking an action. When an externality exists, the decision maker does not bear all the costs or reap all the gains from his or her action.