OTTAWA — Conservative Leader Andrew Scheer pivoted his campaign to the environment on Wednesday, announcing a tax credit for homeowners who make energy-saving renovations, following a scathing attack a day earlier by his Liberal opponent, Justin Trudeau.The 20 per cent refundable tax credit could be worth up to $3,800 annually, he said, as he shot back at Trudeau’s new promise on Tuesday to achieve zero net carbon emissions in Canada by 2050.Scheer said Trudeau hasn’t met Canada’s greenhouse gas reduction targets for 2030, so there’s no point in taking his plan seriously for 2050. He reiterated the new Conservative plan would give Canada the “best chance” to reach the 2030 targets, but his announcement carried no detailed analysis. Breaking down the parties’ tax-cut pledges in an election that’s evolved into a bidding war for votes Andrew Scheer is right. It’s time to end corporate welfare in Canada Conservatives court small business, pledging to end red tape ‘rat’s nest’ “These are all measures specifically designed to lower Canada’s emissions, but also lower global emissions,” Scheer said in Jonquiere, Que. “Canada is not the problem. We can shut down our entire economy here and within a matter of days, the production in China would replace everything that we produce here — all the emissions that we emit here.”On Tuesday, Trudeau branded Scheer as backwards and out of step on fighting climate change, linking him to Conservative politicians such as Doug Ford and Jason Kenney, the Ontario and Alberta premiers.It was part of an attempt by Trudeau to reframe the election around the environment after last week’s revelations of his history dressing up in black- and brownface knocked his re-election bid off course. He has linked himself to the rising protest of young people around the world that is gaining momentum through the bitter scolding of world leaders that teenaged climate activist Greta Thunberg levelled at the United Nations this week.Trudeau also provided no costing details to accompany his announcement Tuesday to accompany his 2050 pledge and his commitment to halve the income-tax rate for companies that produce zero-emission technologies.Green Leader Elizabeth May opened Wednesday’s campaigning by offering a detailed spending breakdown of her party’s platform. She pledged that her party, if elected, would balance the federal budget by 2024.“We are able to put before you a budget that is balanced in five years. But to do that we have a number of really large, new revenue pieces,” she said in Halifax.May proposed a series of new tax measures that she said would create tens of billions of dollars of new revenue for federal coffers. Among them was what she called a “very small tax on financial transactions” that she said would raise $18 billion by 2025.May said the Greens would increase corporate taxes, close the capital gains loophole, apply a wealth tax to Canadians with more than $20-million dollars and eliminate fossil-fuel subsidies.Previously, the Greens promised new spending to introduce universal pharmacare, abolish tuition for post-secondary education and provide universal child care, as well as protecting the environment.Scheer has also promised Canadians a balanced budget, but has yet to explain exactly how. Trudeau says he is committed to investing in the future of the country, and has made no apologies for running deficits to do that.Trudeau is one of three federal leaders in British Columbia on Wednesday, where the NDP’s Jagmeet Singh is to meet with Vancouver Mayor Kennedy Stewart, a former NDP MP. Singh holds Stewart’s old seat.The NDP say Singh will unveil a “new deal” to make life more affordable in B.C.Singh has already promised to cede authority in several areas to Quebec, including on the environment, immigration and justice, as part of his vision for more asymmetric federalism, in which the provinces don’t all have the same relationship with the federal government.Trudeau will be in Delta, B.C., where he’s expected to make another announcement on the environment before flying back east to a rally in Thunder Bay, Ont.And People’s Party Leader Maxime Bernier begins a western tour, his first extended trip of the campaign, with an appearance at the Surrey, B.C., board of trade.Singh made climate-change promises of his own on Tuesday, including pledging to electrify Canada’s public-transit fleets by the end of the next decade and to construct a coast-to-coast, clean-energy corridor.The NDP called Trudeau’s climate-change policies hypocritical because of the government’s $4.5-billion purchase of the Trans Mountain pipeline project.Trudeau and Singh managed to speak late Tuesday about the times Trudeau darkened his skin for costumes, but neither camp would say just what they talked about.