目前环境污染形势十分严峻。

Mùqián huánjìng wūrǎn xíngshì shífēn yánjùn.

At present, the situation of environmental pollution is extremely serious.

面对严峻的挑战，我们必须团结合作。

Miànduì yánjùn de tiǎozhàn, wǒmen bìxū tuánjié hézuò.

Facing severe challenges, we must unite and cooperate.

在如此严峻的现实面前，我们更需要保持乐观。

Zài rúcǐ yánjùn de xiànshí miànqián, wǒmen gèng xūyào bǎochí lèguān.

In the face of such harsh reality, we need to stay optimistic even more.