 More recently, atmospheric scientists have come upon the phenomenon of the reduction of  sunlight reaching Earth's surface observing a nearly a 10\% decline since 1960.
<meaning-changed>  More recently, atmospheric scientists have come upon the phenomenon of the reduction of  sunlight reaching Earth's surface observing a nearly a 10\% decline since 1960.
 More recently, atmospheric scientists have come upon the phenomenon of the reduction of direct sunlight reaching Earth's surface observing a nearly a 10\% decline since 1960.