In the British Columbia example, there was a carbon tax in place since 2007. A 2015 study showed that emissions were reduced by 5% to 15%. It is true in the last few years that emissions have risen. However, B.C. has seen huge economic growth and population growth, so overall emissions were more. That being said, there's overwhelming evidence that having a carbon tax in place significantly bent the curve downwards and led to less emissions than would have been produced had there not been a carbon tax in place.
On January 30th, 2019. See this statement in context.