8-year-old’s lemonade stand helps combat human slavery. How you can contribute.

Vivienne Harr says she is making a stand, both literally and figuratively, to end human trafficking. The 8-year-old California girl is using a homemade lemonade stand to raise $150,000 for the nonprofit group Not For Sale, which works to end slavery around the world.

"I will sit at my lemonade stand every day--rain or shine--until i raise $150,000 for: not for sale an organization that is "re-abolishing" slavery," Vivienne writes on her website. "When you buy #MAKEASTAND! lemonade, you aren't just buying a drink, you are MAKING A STAND! 100% of our profits go to not for sale."

But Vivienne could use some help. So far, she has raised about $1,000, with 19 day left toward her financial goal. So how can you help?

Back in April, we reported on the 6-year-old Texas boy whose lemonade stand raised more than $10,000 for his Dad's cancer treatment in a single day. Yahoo! Sideshow readers helped donate more than $20,000 after the story broke.

And in June, Yahoo! Sideshow readers stepped up again, making a major contribution to the recovery efforts of Miami "cannibal" victim Ronald Poppo.

These were opportunities for readers to contribute to and impact an unfolding story. When these opportunities arise, Sideshow likes to bring them to the attention of our readers, who seem interested in contributing to a worthwhile cause, whether through their pocketbooks or through spreading the word.

If you'd like to help, you can make a direct donation to Vivienne's cause by following the link at the top of this page to her website. Or if you're in the Fairfax, Calif., area in Marin County, you can stop by her lemonade stand.

Vivienne's direct-pitch video: