The environmental risk is not from the jets using more fuel, but from unregulated shipping through the Arctic. Investing resources on stealth fighters at the expense of a real ice capable navy / coast guard leaves more gaps in our national security than the number of square centimeters of radar exposure on an F35 vs a take your pick of other jets.
Again, if you believe that our greatest threat is other nations carrying out air superiority campaigns against the RCAF, then the F35 is probably the best plane out there. I believe we should have updated fighters and we should actually be able to sail around our own coastline at the same time. I'm not saying don't have an air force any more than you're saying we should buy 19,000 F35s.
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