Mea culpa. My brain skipped right over the vague anecdote intended to show that it's ineffective. Obviously actual data are needed.

>The 12.9% decrease in British Columbia’s per capita emissions in 2008-2013 compared to 2000-2007 was three-and-a-half times as pronounced as the 3.7% per capita decline for the rest of Canada.

https://www.carbontax.org/blog/2015/12/17/british-columbias-...