Air is very important to everything that lives. But the air we breathe is g dirty. People all over the world are looking for w to make it clean again.
Have you e watched the smoke from chimneys(烟囱) rising high in the air? Have you s the smoke from cars and trucks on roads or the smoke from planes? The smoke is not g to breathe. If we want to keep healthy and strong, we need to breathe c air.
W more and more factories everywhere and more and more cars, trucks and planes, it is getting harder and harder to do with the air p.
Scientists have a taken actions to stop or slow down some of the things that make the air dirty. They will not stop working u we have clean air again.
微信扫码预览、分享更方便
