A scientist at NASA has the answer...

"We live in the atmosphere of the sun. So when the sun sneezes, the Earth catches a cold," explained Nicky Fox, deputy project scientist at Johns Hopkins University Applied Physics Laboratory (APL) in Laurel, Md. "So whatever is happening on the sun, the Earth will feel an effect and will respond to that changing space weather."

To see the context within which this curious comment was made (the living with a star program), watch the video...