"The total carbon impact of a single flight is so high that avoiding just one trip can be equivalent to going (gasoline) car-free for a year"
https://davidsuzuki.org/what-you-can-do/air-travel-climate-change/
Billy Bishop is a regional airport, meaning short distance flights - one of the most polluting modes of travel.
Not only that, short distance flights are not even very time competitive with more fuel efficient modes like rail (or even a bus) when you consider time required at the airports (and transportation to & from).
The idea of an electric ferry is a good one. At Billy Bishop airport however it is just window dressing.
Any real climate change plan includes passenger rail.
Fortunately, our Canadian Federal Government is listening:
VIA Rail Welcomes New Siemens Trainsets
https://www.railwayage.com/passenger/intercity/via-rail-welcomes-new-siemens-trainset/
Federal government moving forward on electrified 200km/h High Frequency Rail
https://www.transportaction.ca/national-news/federal-government-moving-forward-on-high-frequency-rail/