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"Our approach is an important step toward finding an efficient way to convert CO2, a potent greenhouse gas that poses a significant challenge for humanity, into an easily storable and transportable liquid fuel," said Brookhaven Lab Senior Chemist Javier Concepcion, a lead author on the study.

Predictable harvests and storable surpluses were needed, traditional thinking went, to support large sedentary populations, monumental architecture, and stratified societies—all of which made up what archaeologists called the Neolithic package.

Samples must also be easily storable for return to Earth; space station astronauts currently use vials that take up valuable freezer space.

But without better storage technology, we’re stuck with using easily storable fossil fuels, which are dirtier and subject to geopolitical turmoil.

At wood pellet mills, wood is chipped, dried, ground and compressed into uniform, easily storable pellets.