A report on acid rain concluded, most forests in Canada are not damaged by acid rain. Critics of the report insist that this conclusion must be changed to, most forests in Canada do not show obvious symptoms of being damaged by acid rain, such as abnormal leaf loss, slower growth or higher mortality.
The statement 'The report does not compare the damage caused by acid rain to forests in Canada with the damage caused by acid rain to forests in other countries' provides the most logically strong justification for critics' insistence on changing the conclusions of the report.