How close are we to guilt-free flying?

Airlines have pledged carbon-neutral travel and use of alternative fuels to reduce pollution. Electric airplanes also raise hopes for green air travel. But how close are we really to impact-free air travel?
Airlines have pledged carbon-neutral travel and use of alternative fuels to reduce pollution. Electric airplanes also raise hopes for green air travel. But how close are we really to impact-free air travel?
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