An activist and documentary filmmaker, Paul was first elected in a 2019 by-election, and then re-elected in the general election later that year. During the last Parliament, he was a dogged voice on climate, challenging Liberal climate delay and proposing legislation to reign in fossil fuel expansion. In late 2020 he tabled a bill to ban coal exports from Canada and presented a number of climate motions, including M-90, which called for a federal fracking ban in Canada.