The only long-term solution is to convince your acquaintances to have at most one kid, or to make sure your kids join a space-faring company ;)
"I know that most men, including those at ease with problems of the greatest complexity, can seldom accept even the simplest and most obvious truth if it be such as would oblige them to admit the falsity of conclusions which they have delighted in explaining to colleagues, which they have proudly taught to others, and which they have woven, thread by thread, into the fabric of their lives."
... or in other words: the most relevant component in the light pollution factor is the exponential factor of human reproduction.
"I know that most men, including those at ease with problems of the greatest complexity, can seldom accept even the simplest and most obvious truth if it be such as would oblige them to admit the falsity of conclusions which they have delighted in explaining to colleagues, which they have proudly taught to others, and which they have woven, thread by thread, into the fabric of their lives."
... or in other words: the most relevant component in the light pollution factor is the exponential factor of human reproduction.