Pre-reading Activities: Warm-up Questions 2. In the discussion of the“ greenhouse effect”, what do scientists disagree about? And, what points do they agree on? Skim paragraphs 3 and 4 to look for your answersPre-reading Activities: Warm-up Questions 2. In the discussion of the “greenhouse effect”, what do scientists disagree about? And, what points do they agree on? Skim paragraphs 3 and 4 to look for your answers