I believe the correct answer is: They introduce the solution to the negative effects of cooking in the developing world that appears in later paragraphs.
In this excerpt from “A Cooking Revolution: How Clean Energy and Cookstoves Are Saving Lives” written by Chef Jose Andres, these paragraphs contribute to the development of the author’s argument by introduce the solution to the negative effects of cooking in the developing world that appears in later paragraphs. Namely, after listing the negative effects of the way of preparing food in developing world, Chef Andres introduces the partnership of the United State government and United Nations in developing a market for cookstoves and fuels which will lower the emission.