| [00:00.30] |
|
| [00:01.51] |
As is shown by the two graphs, |
| [00:04.00] |
the U.S. population soared from 2 million to 250 million from 1800 to 1990. |
| [00:12.10] |
In contrast, the number of wildlife species no longer existing shot up, |
| [00:17.93] |
adding up to 70 over the same period of time. |
| [00:21.89] |
It is obvious that the extinction of wildlife resulted from the population explosion. |
| [00:27.74] |
We may cite a variety of reasons for this situation. |
| [00:31.90] |
First of all, the destruction of ecological balance plays a pushing role. |
| [00:36.90] |
Due to population problems, |
| [00:39.18] |
pollution and desertification are becoming increasingly serious. |
| [00:43.84] |
Furthermore, a great number of species were killed for food, for money and even for fun. |
| [00:51.03] |
Even worse, with the rapid growth of human population, |
| [00:54.71] |
inhabitable areas were expanding so fast that few areas were left for wild animals. |
| [01:01.24] |
To sum up, it is imperative for us to take effective measures to protect wildlife. |
| [01:06.89] |
Firstly, the U.S. government should pour more investment into wildlife protection |
| [01:12.23] |
in a bid to create a better environment. |
| [01:15.05] |
Secondly, the birth rate in the U.S. must be put under control |
| [01:20.16] |
as the dramatically expanding population gives rise to serious environmental problems. |
| [01:26.77] |
|
