The Kyoto Protocol sets a specific time period – known as the first commitment period – for Annex I Parties to achieve their emission reduction and limitation commitments..

The Protocol sets binding targets for developed countries, known as
“Annex I Parties”, to limit or reduce greenhouse gas emissions.It has
established innovative mechanisms to assist these Parties in meeting
their emissions commitments.The Kyoto Protocol sets a specific time period – known as the first
commitment period – for Annex I Parties to achieve their emission
reduction and limitation commitments, commencing in 2008 and
ending in 2012.