Cover Story

Curbing contrails

By Keith Button

May 2021

As surprising as it might be, contrails exceed carbon dioxide as jet travel’s greatest contributor to global warming. Reduce the contrails, and you could immediately soften the sector’s climate impact. Achieving that could be the hitherto unspoken benefit of shifting aircraft to sustainable aviation fuels derived from crop residue or food waste. Keith Button spoke to scientists who are measuring the effects.

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Opinion

Why it’s time to reach for full reusability

May 2021

Now that SpaceX has vividly demonstrated the promise of reusability in space launch, it’s time to revive the goal of aircraft-like reusability of launch vehicles. Eugene A. Ustinov and Philip I. Moynihan, both formerly of NASA, make the case and present a concept.

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