Original sentence: Believers in Global warming assert that global temperatures are rising as a result of human activity, and that this warming will have serious consequences for mankind.Global warming skeptics doubt one or both of these assertions, or believe them to be not proven.Some also believe that while global warming may be man-made, there is no need to take action now as future scientific advances will solve the problem before it becomes serious.They therefore believe that action should be taken to counteract this effect
Edited sentence: A skeptic is different from someone who believes the hypothesis is not true.Global warming skepticism is when the facts about the global warming hypothesis are studied instead of accepting statements about global warming as being factual