What is unusual about the written form of the chinese language?
a. the written characters are nonphonetic and give no clues to pronunciation.
b. few people can actually write in chinese because the language is complex
c. each ethnic group in china has its own version of written chinese.
d. there was no written form at all before the great cultural revolution.

"The written characters are nonphonetic and gives no clues to pronunciation" is unusual about the written form of the Chinese language.

Explanation:

it is very hard for the climatologists to precisely predict how will the global temperatures be changing so there's lots of models, some of which differ significantly, this is due to multiple factors, and probably the most important is the human activity.

humans have been a key factor in climate change around the globe since the start of the industrial revolution, and in the past few decades the consequences are becoming more obvious. there's lots of emission of pollutants in the atmosphere as well as changing the environment on the surface itself, so it's really hard to predict how will that go in the future because there's some countries that are reducing the damage and are going towards green energy, while others are stubbornly continuing with pollution and damages to the environment.