This ebook consists of a summary of the ideas, viewpoints and facts presented by Naomi Oreskes and Erik Conway in their book “Merchant of Doubt, How a Handful of scientists Obscured the Truth on Issues from Tobacco Smoke to Global Warming”. This summary offers a concise overview of the entire book in less than 30 minutes reading time. However this work does not replace in any case Naomi Oreskes and Erik Conway book.Oreskes and Conway argue that science must wait until empirical proof emerges to draw conclusions. Hence they say that the best way to discredit science regarding the climate change debate is to create doubt and spread confusion.