Leaves can regulate the climate and purify the environment. Please give an example.

1. Leaves can secrete a substance to absorb dust in the air and purify the air. For example, two rows of trees on both sides of the road can also reduce noise;

2. Leaves have photosynthesis, absorbing carbon dioxide and releasing oxygen. For the world with serious greenhouse effect, planting trees can adjust the climate. Excessive carbon dioxide will lead to rising temperature and global warming, and the adjustment of leaves to climate is reflected in this role. Absorbing carbon dioxide and releasing oxygen will keep the global climate temperature at a certain level.