In this question, a sentence has been divided into four parts marked as I, II, III, IV. You need to find which part/parts does not/do not have an error in terms of grammatical and contextual usage. If the sentence is contextually correct, mark "No Error" as your answer. 

I - Net zero emissions means that
II - any new greenhouse gas
III - emission are balanced by absorbing
IV - a equivalent amount from the atmosphere.