In stories about time travel we are often admonished that changing even one small thing in our past will have an immeasurable impact on the present, effectively creating a whole new timeline. While we often see the changes as negative, they don't have to be.
Today you have choices. You can choose to drive yourself to work, or carpool. You can choose to make a lunch at home, or buy fast food with extra packaging. You can choose to throw your trash away or recycle it.
Throughout every day we make seemingly small choices that have an immeasurable impact on the future.
Keep track of the small things that you do and encourage the people you know to also make a choice that creates a better future.
If we all do one small thing, every day, the world will become a better place faster than you can imagine.