In 2002, the Bush Administration's EPA issued a Climate Action Report concluding that the climate changes observed over several decades "are likely mostly due to human activities, but we cannot rule out that some significant part of these changes is also a reflection of natural variability". While the EPA report was initially hailed by some environmentalists critical of the Bush administration as a "180-degree turn on the science" reversing "everything the president has said about global warming since he took office," within days President Bush dismissed the report as being "put out by the bureaucracy," and reaffirmed his opposition to the Kyoto Protocol.