After all, at the same time you point to the current weak sun as some type of long - term cooling agent. (ourchangingclimate.wordpress.com)
She adds, «We think that a change in the magnetic activity of the sun along with a series of strong solar bursts, or a very weak sun, may have caused the unusual tree ring data.» (sciencedaily.com)
Shorter daylight, colder weather and weaker sun rays in certain parts of the country make it difficult to produce enough vitamin D. Spending less time outdoors with your skin exposed may lead to less - than - optimal levels. (healthyeating.sfgate.com)