Kyoto protocol (13 dez 1997 ano – 16 fev 2005 ano)
Descrição:
 The kyoto protocol is an international agreement that was signed in 1997 and was put in effect in 2005. This agreement forced nations that ratified it to limit their greenhouse gases emissions, in an attempt to mitigate the impacts of climate change. 
Adicionado na linha do tempo:
Data:
13 dez 1997 ano
16 fev 2005 ano
 ~ 7 years and 2 months