Assuming I am writing a formal letter/essay for CAE exam, should I use reduced relative clauses and participle clauses? I mean, are they formal?
"(Having been) Proved by scientists leading(who are leading) an international group of experts in biology, global warming is rising quickly". ( examples for participle clause at the beginning + reduced relative clause)
In order to be very very formal, should I write as I did in this example, omitting... Or I should write the sentence below?
" As it has been proved by scientists..that global < (even if, to me,it sounds incorrect because I think I should write the object after proved)
I want it to be as much formal as possibile (taking into account the fact of writing in an impersonal style)