Why doesn't Canada have more electric school buses?

Kids like them because they're quieter and less stinky — plus, they don't have to worry about their ride to school contributing to climate change. Data even links riding e-buses to higher test scores. So why is only two per cent of Canada's school bus fleet electric?
Source: Why doesn't Canada have more electric school buses? (https://www.cbc.ca/news/politics/green-school-bus-funding-delays-1.7314006?cmp=rss)
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