Can One Person Make a Difference

We were young once when life was smooth and natural and we had our entire lives in front of us. Kids went barefoot and played in the woods all summer, staying outside until dark until you could hear the crickets chirping and the frogs croaking, a time before noisy motor traffic drowned them out. It was a period when you could sleep outside on the lawn and see the stars at night and wonder about your place in the cosmos and on earth and if what you were doing really mattered in the big scheme of things. If time is infinite, then the time span of life on earth is but a mere spec and one person couldn't really affect the scope of its existence, whether it turn out wretched or virtuous. Or can one person really change the world?