This project is based on humans creating some small pollution every day, although it is very small or invisible, this pollution will also accumulate and cause a certain degree of pollution. And my idea is to make the invisible become visible. I use a paint called Thermochromic ink, this inks take advantage of thermochromism, which refers to materials that change their hues in response to temperature fluctuations. The reason I choose this ink is that it can fit with the global warming topic, when people wear this T-shirt, the typography when from white turn to black. I hope people can realise the situation from now on.