Bill C-377 was first introduced October 2006, and passed third reading 148 to 116 on June 4, 2008 with only the Conservatives voting against it. However, Bill C-377 died when Parliament was dissolved for the 2008 Canadian federal election.

The Climate Change Accountability Act was re-introduced for first reading, this time as Bill C-311, on February 10, 2009. Bill C-311 passed third reading May 5, 2010 149 to 136, with once again only the Conservatives voting against the Bill. It received 1st Reading in the Senate May 6, 2010 and was debated several times before being defeated at 2nd Reading on November 16, 2010. It is very rare for the Canadian Senate, to overturn legislation passed by Canada’s elected Parliament.

New Democrat Environment Critic Megan Leslie presented the Climate Change Accountability Act, now Bill C-224, June 15, 2011 in exactly the same form as when introduced in 2006.

The Bill sets green house gas emission targets – it mandates a 25% reduction from 1990 levels by 2020, and an 80% reduction by 2050.

"The Bill is important because it would provide a touchstone and a rallying point for Canadians concerned about the need for real science-based targets. It would help inform policy-makers about what needs to be done in taking a significant role in addressing climate change," said Leslie as she introduced the bill for its third round of first reading in Parliment on June 15, 2011.