More than 60 influential scientists, including 20 Nobel laureates, issued a statement yesterday asserting that the Bush administration had systematically distorted scientific fact in the service of policy goals on the environment, health, biomedical research and nuclear weaponry at home and abroad.

According to the report, the Bush administration has misrepresented scientific consensus on global warming, censored at least one report on climate change, manipulated scientific findings on the emissions of mercury from power plants and suppressed information on condom use.