The Greta Thunberg UN Speech meme, famously known as the 'How Dare You!' meme, originates from the young Swedish activist's impassioned address at the 2019 UN Climate Action Summit. During her speech, she condemned world leaders for their inaction on climate change, delivering the line with visible emotion and intensity. While the original context was a serious call for environmental justice, the internet quickly repurposed her expressive face and signature quote into a versatile reaction template. It is now widely used to represent mock outrage, dramatic disappointment, or extreme offense in both political and relatable everyday scenarios.