# Thread: According to the IPCC

1. ## According to the IPCC

According to the IPCC, we'd have to reduce GHG emissions by 50% to
80% of -------they're on track to be in the next century to reach this level.

A) what
B) where
C) whenever
D) that
E) which

Could you explain me why the key is A?

2. ## Re: According to the IPCC

According to the IPCC, we'd have to reduce GHG emissions by 50% to
80% of what they're on track to be in the next century to reach this level.
reduce by 50-80% of what they are on track to be
GHG emissions are on track to be a certain level (=what)
we reduce what (that level which is on track to be in the next century) by 50-80% --> we reach "this" level

We need a nominal relative pronoun. Which of the given option is one? "what" is.

3. ## Re: According to the IPCC

Originally Posted by Volcano1985
According to the IPCC, we'd have to reduce GHG emissions by 50% to
80% of -------they're on track to be in the next century to reach this level.

A) what
B) where
C) whenever
D) that
E) which

Could you explain me why the key is A?
You use what because it is a compound relative, including both the antecedent(cause) and the relative(effect), and is equivalent to that which; for example, "I did what he desired" means the same as, "I did that which he desired."

4. ## Re: According to the IPCC

I know that prepositions come before relative pronoun or at the end of the relative clause, so "of" can be used at the end in this sentence?

5. ## Re: According to the IPCC

Originally Posted by Volcano1985
I know that prepositions come before relative pronoun or at the end of the relative clause, so "of" can be used at the end in this sentence?
that is true when the clause introduced is an independent clause.
In formal writing, a preposition in a relative clause often appears together with the relative pronoun when the relative pronoun happens to either whom or which. You can put the preposition at the end also as can be seen in the following examples with idependant clauses in red.
Jack is the boy with whomJenny fell in love
Jack built the house in which I grew up.
Jack is the boy whoJenny fell inlove with
Jack built the house where I grew up in.

But in this case it is a dependent adjective clause. So it is proper to place the preposition together with the relative pronoun what.

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