A fourth problem is that environmental and other scientists must use statistical sampling and methods to estimate some numbers. For example, there is no way to measure accurately how much soil is eroded worldwide or how much forest is cleared every year. So thes numbers are eatimated by using the best available sampling and statistical techniques.
第四個問題是自然環境和其他科學家必須使用統計資料取樣跟方法對估計一寫數目.例如,沒辦法準確測量有多少在全世界的土壤侵蝕風化或弄清楚在每一年有多少森林.所以這些數目透過估計被使用最好可提供取樣和統計資料技術
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