president ` believes that to deny the existence of climate change is to deny an observable fact that is substantiated by science , ' press secretary said .
he added : ` and there are some who are involved in politics that choose to deny that fact because it 's inconvenient to their case and it might be inconvenient to some of their strongest political supporters '
remarks followed the president 's gas guzzling , 1,836 mile trip on wednesday , earth day , to the florida everglades aboard air force one .