According to an AP article, Bush did dismiss the Global Warming report...;
"President Bush dismissed on Tuesday a report put out by his administration warning that human activities are behind climate change that is having significant effects on the environment."
"I read the report put out by the bureaucracy," Bush said dismissively Tuesday when asked about the EPA report, adding that he still opposes the Kyoto treaty."
No way this can be interpreted as Bush standing behind the EPA report.
from;White House Warns on Climate Change.... By John Heilprin... Associated Press Writer... Tuesday, June 4, 2002; 12:58 PM