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![California Agriculture, Vol. 70, No.1 California Agriculture, Vol. 70, No.1](http://ucanr.edu/sites/calagjournal/files/issuecovers/CAv070n01.jpg)
Fruit and nut trees, like these in a Yolo County walnut orchard, need a certain amount of cold weather each year for proper foliage and flower development. As the climate warms, declining annual chill hours — the total number of hours when the temperature falls between 32°F and 45°F — may change where crops are grown. Photo by Will Suckow
Editor Jim Downing talks about what's in the current issue of California Agriculture journal — wild horses, the economics of beef, groundwater in California and more.
Volume 70, Number 1