"WHAT THE WEST'S ANCIENT DROUGHTS SAY ABOUT ITS FUTURE"

THE CULMINATION

• Entering its dry period
• Weeks of dry skies conjure up uneasy memories
• Farmers fed thistles and cactuses to cattle

CLUES FROM ANCIENT TREES

• varying widths of tree rings
• 600 years of Colorado River flow using ring records
• Dry in 1580 that the giant sequoias
• The tree is 27 feet in diameter
• Its foot print cover dinning room

MEGADROUGHT

• 1,400 climate-sensitive tree-ring
• Occurred from 1276 to 1297 may have contribute
• Evidences can be found in
• A drought from 850 to 1150
• Dating revealed that they grew

IMPLICATION ARE FRIGTENING

• More wildfires
• Less water
• More than 38million people