麻烦哪位英语高手帮帮忙，解答下这个英语小问题，

Question

One way to estimate how all the various processes leading to climate variability will combine is by using computer models of the global climate.
请问这个句子里面的how引导什么从句？
麻烦帮我详细分析下这个句子嘛，这个句子中One way to estimate how all the various processes leading to climate variability will combine 是主语从句吗？如果是，从句的谓语动词时哪个estimate吗？这个好像是非谓语动词啊，求解答~~~
麻烦哪位高手帮我具体分析下这个句子的各个成分嘛，感激不尽~~~

Answer 1

how引导宾语从句

Answer 2

One way to estimate how all the various processes leading to climate variability will combine 宾语，修饰estimate，
estimate不是非谓语动词

Answer 3

宾语从句

Answer 4

宾语从句

Answer 5

谓语从句