You're a god damn moron. Anything we build on this Earth yields absolutely no net gain in mass for the Earth because everything we build comes from the Earth itself. We just change the mass into different shapes and forms. Ever since day one the net mass of the Earth has always been the same.
Wasn't the best way to word that, I know
But I've gotten rather used to the people on this site having an IQ lower than their shoe size I thought it would be best to put it in a way for them to understand