I love this analogy of how much influence each of us has on the consciousness of our planet:
Imagine a beautiful clear pool of water. Imagine that every time someone is negative, mean, or harmful to themselves or others, a drop of black water is dropped into the clear beautiful pool. With enough people whose energy is dark, it doesn't take too long before that clear pool starts to get darker and murky.
Now imagine that every time someone is kind and caring with themselves and others, and every time someone is joyful, a drop of crystal-clear water is dropped in the pool. With enough happy, kind, and caring people, the water begins to clear.