Mr. Chair, the credit was introduced in 2006. The goal of the credit was to increase public transit use and, through that use, have a positive effect on greenhouse gas emissions and traffic congestion. A number of research studies have shown that it hasn't had that effect. The effect on public transit use has been very limited, and, by extension, the effective cost of reducing greenhouse gas emissions extremely high. That's the primary rationale for eliminating the credit.
On May 8th, 2017. See this statement in context.