On top of it being dark, it rained, which made the going even tougher.

天很黑，又下着雨， 路更难走了。

《新英汉大辞典》

The soot released into the air as a consequence is also a climate-changer because, being dark, it absorbs heat.

黑烟散发到空气中，其结果还会导致气候变化，因为黑色吸热。

youdao

Many of them burn wood, waste and dung indoors for heating and cooking. The soot released into the air as a consequence is also a climate-changer because, being dark, it absorbs heat.

很多农民通过燃烧木头、垃圾和粪便来取暖、烧饭，排放到大气中的煤烟因为是黑色而吸热同样会造成气候变化。

youdao

The missing lizard is described as being dark green and black in colour, with around half its length being its tail.

BBC: Black-throated monitor lizard

The male passenger was described as being dark skinned, with dark hair which was greying around the temples and a dark moustache.

BBC: Baberton Mains Hill

The driver was also described as being dark-skinned.

BBC: Baberton Mains Hill