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The New Supersonic Boom

Cars That Think

Piloting the bullet-shaped Bell X-1 rocket plane in 1947, Chuck Yeager became the first person to exceed the speed of sound while in horizontal flight. The main obstacles will be regulatory and, especially, environmental: Supersonic airliners could be hugely more polluting than their subsonic counterparts. Everett Collection/Alamy.

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Summer Update

Plug In Partners

The list of supporters/partners now includes links to the members’ web sites along with a contact person. Paul plant, and direct the Minnesota Pollution Control Agency to study the environmental impacts of purchasing PHEVs for the state-owned vehicle fleet and various other levels of penetration among the public.