"We have a monumental task in front of us," says co-author Natalie Mahowald, from Cornell…

Duane Townsend

"We have a monumental task in front of us," says co-author Natalie Mahowald, from Cornell University, "but it is not impossible." In 50 years, she says, "it's going to be very different. This is our chance to decide what that road will look like."

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