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This is Scientific American's 60-second science. I'm Christopher Entaliata. Got a minute?

California has been in the grips of a record-setting drought since 2012, but don't just blame

lack of precipitation.

It's nothing exceptional in the context of the last thousand years.

However, higher temperature, this is the teacher of this drought.

Sumaya Belmishri, a paleo-climitologist at the University of Arizona.

She and her colleagues used two different sets of historic tree ring records to reconstruct

500 years of climate history, blue oak tree rings as a proxy for winter precipitation,

and another set of rings from a variety of trees as a proxy for winter temperatures. The tree rings as a proxy for winter precipitation, and another set of rings from a variety of

trees as a proxy for winter temperatures. The tree ring data made it possible to model Sierra

Nevada snowpack going back to the year 1500, and the researchers found that today's snowpack

is just 5% of its average level over the last five centuries. The findings in the journal Nature Climate Change.

Belmishri says that the decline in snowpack is a big deal in a place like California with its

Mediterranean-like climate.

You can think about it as a water bank that can be used later in the spring and in the summer

when it melts.

But since temperatures don't look to be on a downturn, she says we shouldn't necessarily

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