I'll try to answer both questions.
It's the job of parliamentarians to follow up. Public accounts require all departments to produce an action plan one year after they have been subject to a report. This committee did the same thing by following up on the work. At the Office of the Auditor General, we also conduct follow-up audits, including one focused on reducing greenhouse gases. We need to do another follow-up on the Canadian Environmental Protection Act.
You're right to say that follow-up isn't done systematically. It's both our job and the job of parliamentarians to do follow-up and ask that the departments be accountable for their implementation of the recommendations.
The 2030 target was established by the government already. In its pan-Canadian plan, Environment Canada said that emissions would go down, but there is still a deficiency. There will have to be more action in this area if all the measures are taken within the prescribed time frame.
Regardless, it's the department that should answer your question.