Millions of Years Ago, These North American Forests Disappeared for Good
[html]Drier winters (not summers) may be behind their transition to grasslands, highlighting the crucial role of winter precipitation in sustaining tree-cover.[/html]
Source: Millions of Years Ago, These North American Forests Disappeared for Good (http://ht**://www.discovermagazine.c**/planet-earth/millions-of-years-ago-these-north-american-forests-disappeared-for-good)
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