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Acid rain will finally affect human health. After acidification of everything in nature, it may change the ecosystem, biological, and ecological function etc, eventually make the Earth more worse.
When people walk in rainy days with this PH umbrella, the surface will change color with rain pH. And it will recover back to the original surface when it dried. Furthermore, you can tally find how worse situation we have in our environment. It also reminds people to be aware of the problem we made. Finally, we will take good care of our only Earth better and better in the future.
Changhua County, Taiwan