Why should I use わけだ and not ものだ in this sentence?


今日一日だけで、人類は新たに二十五万人をこの地球という惑星に加えている。そしてそれは毎日繰り返されている。現状では、毎年ドイツの全人口と同じだけの人間が増えている
_______ 。

1.わけだ 2.ものだ

The answer is 1.わけだ

But I think the last phrase is a statement of fact, which fits ものだ's usage.




ものだ for "cold fact" is used like this:

>   * 人間はいつか必ず死ぬものだ。
>   * 親が知らない間に、子どもは大人になっていくものだ。
>   * パソコンは、5年も使えば壊れてしまうものだ。
>   * 好きな人と一緒にいると、時間があっと言う間にすぎるものだ。
>

(Some of these were taken from [this page](http://j-nihongo.com/monoda/))

～ものだ is used to show an unavoidable, uncontrollable fact everyone should be
aware of. Whether you like it or not, the speaker believes it's the truth of
this world. That's why the same construction also [expresses an
obligation](https://japanese.stackexchange.com/q/17708/5010).

But "毎年ドイツの全人口と同じだけの人間が増えている" is not really a piece of information of which
everyone should be aware. It's no more than his own catchy way of explaining
the aforementioned information. In addition, by using 現状では and ～ている, he
indicates it's a "temporary" fact. In such a case, ものだ is not appropriate.




ものだ for "cold fact" is used like this:

>   * 人間はいつか必ず死ぬものだ。
>   * 親が知らない間に、子どもは大人になっていくものだ。
>   * パソコンは、5年も使えば壊れてしまうものだ。
>   * 好きな人と一緒にいると、時間があっと言う間にすぎるものだ。
>

(Some of these were taken from [this page](http://j-nihongo.com/monoda/))

～ものだ is used to show an unavoidable, uncontrollable fact everyone should be
aware of. Whether you like it or not, the speaker believes it's the truth of
this world. That's why the same construction also [expresses an
obligation](https://japanese.stackexchange.com/q/17708/5010).

But "毎年ドイツの全人口と同じだけの人間が増えている" is not really a piece of information of which
everyone should be aware. It's no more than his own catchy way of explaining
the aforementioned information. In addition, by using 現状では and ～ている, he
indicates it's a "temporary" fact. In such a case, ものだ is not appropriate.

