1 . The earth’s climate is largely controlled by how much of the sun’s light and heat is absorbed and reflected. By absorbing the sun’s heat, trees cool the air.
The interaction of this relationship with an area’s topography (地势), latitude (纬度), and altitude, can create microclimates (微气候), just as trees create microclimates almost any place they are by providing a windbreak (风林) and shade. Think about it: On a hot, sunny day, it’s always cooler beneath a shade tree. A city with more tall trees is cooler in the summer than a similar city with fewer trees, which translates into less energy use and lowers cooling costs. Also, in using less energy, less air pollution is created.
The most important role that rural trees and forests play is taking carbon dioxide out of the atmosphere. The living tissue (组织) of a tree is a storage vault (拱顶) for carbon, which would otherwise contribute to the greenhouse effect and to global climate change. To put it most simply, more trees can decrease the rate of climate change and help us withstand its effects, potentially resulting in less intense storms, fewer infectious diseases, a more stable water supply, and fewer wildfires.
Trees, however, are affected by the effects of climate warming. Areas once too cold to support trees now can, and as forests migrate north, harmful insects that were once held at bay (使不能接近) by winter freezes can do damage to native species. Tropical (热带的) vines called lianas (藤本植物) are now growing faster than the trees they climb, causing trees in the Amazon and other rainforests to die at an alarming rate.
Trees and forests can either be the key to slowing climate change and reducing its effects, or they can become its victims. It’s up to us.
1. Trees are believed to create microclimates in that __________.| A．tress can take in large sum of sunlight |
| B．tress can effectively change the weather |
| C．tress can help us save more money on cooling |
| D．tress can stop the strong wind and supply shade |
| A．more types of trees will be endangered |
| B．some rare forest species will grow faster |
| C．tropical vines find their wonderful world |
| D．some harmful insects will be under control |
| A．Make up. | B．Stand up to. |
| C．Think about. | D．Bring out. |
| A．Greenhouse effect is increasing sharply. |
| B．Climate change does great damage to trees. |
| C．Many native species will be frozen to death. |
| D．Forests and climate change influence each other. |
