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In page Politics of climate change:

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Policies to reduce GHG emissions are set by either national or sub national jurisdictions, or at regional level in the case of the European Union. Much of the emission reduction policies that have been put into place have been beyond those required by international agreements.[citation needed] Examples include the introduction of a carbon price by some individual US states, or Costa Rica reaching 99% electrical power generation by renewables in the 2010s.[citation needed]