Question: If CO2 was powerful enough to cause the warmth two weeks ago, why wasn't it powerful enough to stop the cold now?

Cold snap may reduce US sour cherry crop

FREEZING weather in Michigan, US has harmed sour cherry trees in the region, with some farmers expecting the loss of almost their whole crop.

April frost is threatening Minnesota's apple crop | StarTribune.com

Minnetrista apple grower Lowell Schaper spent a cold, sleepless Monday night driving a tractor through his Minnetonka Orchards, trying to circulate warmer air and protect his budding trees from the chill.

Bill Jacobson hired a helicopter to churn the night air over his family's Pine Tree Apple Orchard in White Bear Lake, an experimental effort his father tried back in the 1960s -- "the last time we needed it," Jacobson said.