![](https://cos-cdn.shuashuati.com/pipixue-web/2020-1231-2005-12/ti_inject-812ce.png)
Global warming becomes really serious and worrying when_________.
A.
fire and dust turned the skies of Indonesia orange
B.
the atmospheric bomb exploded in northeastern Australia
C.
serious disasters take place frequently all across the world
D.
a new hurricane season starts in the Atlantic two months later