Choose the theme of your topic carefully. Don't try to take on a topic that is so broad in scope that it would need a complete book to adequately answer it. Ask yourself these questions: 1). What is the purpose of the article. 2). Who is the audience you are trying to reach? 3). How should I present the information?
Thoroughly research your topic. Get your facts straight. Learn both sides of controversial issues. Even if your position is immutable and you have a definite opinion, by learning fully the opposite viewpoint, you will be in a better position to persuade your reader.
Include elements of differing viewpoints in your editorial. By including relevant aspects of differing viewpoints in your editorial, your article will appeal to a broader audience, and people whose viewpoint differs from yours will be more likely to continue reading and to consider your viewpoint, whereas one-sided arguments can come across as being dogmatic. Reasonableness is essential in dealing with potentially controversial scientific topics.
Your conclusion should tie in directly with your theme, reiterating your thesis and provide practical application of the information. Further, your science editorial should encourage the reader to some further action, instill a desire to know more on the subject or provide the reader with a clearer view of the future with respect to the topic at hand.