 During the term of Stephen Harper, Canada's greenhouse gas emissions decreased from 749 to 726 (Mt) of carbon dioxide equivalent (CO2 eq).In contrast, during the period from 1993 until 2006, under various Liberal governments, Canada's greenhouse gas emissions increased 600 to 749 (Mt) of carbon dioxide equivalent (CO2 eq).The Harper government took credit for the 23 Mt overall reduction in greenhouse gases, while some critics claimed that the Harper government was secretly against measures to curb climate change and global warming.