气候的变化不是一朝一夕的原因，而是逐渐积累的结果。

The laws that forbid the carrying of arms are laws of such a nature. They disarm only those who are neither inclined nor determined to commit crimes.... Such laws make things worse for the assaulted and better for the assailants; they serve rather to encourage than to prevent homicides, for an unarmed man may be attacked with greater confidence than an armed man.

在能源转型中，煤炭在未来几十年仍将是关键的过渡燃料。