Conservative Leader Andrew Scheer held a town hall-style event in Toronto on Saturday where he was challenged by supporters to offer a 鈥減ositive message鈥 on the environment.

If elected this fall, Scheer has vowed to stop Prime Minister Justin Trudeau鈥檚 carbon tax, arguing that it will make life harder for families without significantly reducing emissions. The Liberals argue that the carbon tax is a necessary measure to protect the environment, and that the cost will be offset by tax credits.

Mark Walsh from Willowdale told Scheer that he 鈥渇ully agrees鈥 with him that carbon taxes are 鈥渏ust posturing,鈥 but he wanted to know, 鈥淲hat, if anything, would you as a government do?鈥

鈥淲e need a positive message out there,鈥 Walsh said.

Scheer said the environment is 鈥渁n important issue,鈥 adding, 鈥渨hen we talk about making life better for the next generation of Canadians, the environment is perhaps the key part of that.鈥

But, Scheer said, 鈥渢he carbon tax is not an environmental plan.鈥

鈥淲hen Conservatives, when we unveil our plan, I can tell you it will be based on a few key principles,鈥 Scheer said. 鈥淥ne is to reward reductions, not punish commuters. It will be based on incentivizing large emitters to reduce their emissions and rewarding individual choices for Canadians 鈥 Things like making it easier to invest in making your homes more efficient.鈥

Scheer also said it鈥檚 important for Canada to also take credit for 鈥渨hat we do well here.鈥

鈥淲e don鈥檛 do the world any favours if we bring in a tax that chases away investments and jobs and factories shut down in Canada only to pop up in other countries without environmental standards, without access to clean technology, without access to clean energy,鈥 he said.

He offered the example of aluminum manufacturing, saying the world is worse off if Canadian aluminum plants that use renewable hydroelectric energy close down and are replaced by Chinese factories using coal-fired electricity.

Another audience member also challenged Scheer to elaborate on his environmental plan. Scheer did not offer specifics but said there will be announcements in 鈥渢he very, very near future.鈥

鈥淭he Liberals are very good at symbolism,鈥 Scheer added. 鈥淭hey鈥檙e very good at talking the talk, of using the buzzwords, getting their picture taken and government by Instagram. But it鈥檚 Conservative governments that have actually delivered real change and real investments in the environment.鈥

Prime Minister Justin Trudeau was also challenged on the environment at a town hall Friday in Saint-Hyacinthe, Que.

One man asked Trudeau how he could claim to support the environment after his government purchased the Trans Mountain pipeline in B.C.

Trudeau suggested Canadians will be dependent on fossil fuels for the foreseeable future, and Canada needs to get its oil to market.

In December, Minister of Environment and Climate Change Catherine McKenna accused the Conservatives of wanting to 鈥渂acktrack on climate action.鈥

the Canada-U.S. Air Quality Agreement signed between former Prime Minister Brian Mulroney and U.S. President George H.W. Bush to stop acid rain involved a tax on pollution