Refute
Part of speech: verb
Definition: To prove (something) to be false or incorrect. To deny the truth or correctness of (something).
Example sentence: Class of 2009: you are going to have to figure out what it means to be a human being on Earth at a time when every living system is declining, and the rate of decline is accelerating. Kind of a mind-boggling situation... but not one peer-reviewed paper published in the last thirty years can refute that statement.
Controvert
Part of speech: verb
Definition: To dispute or argue using reason.To be involved or engaged in controversy.