Head of Site

Hi!
How do i reduce this from first page head:
is it possible or i will get error?

@import "/modules/book/book.css";
@import "/modules/cck/content.css";
@import "/modules/date/date.css";
@import "/modules/event/event.css";
@import "/modules/fckeditor/fckeditor.css";
@import "/modules/lightbox2/css/lightbox_alt.css";
@import "/modules/node/node.css";
@import "/modules/poll/poll.css";
@import "/modules/system/defaults.css";
@import "/modules/system/system.css";
@import "/modules/user/user.css";
@import "/modules/cck/fieldgroup.css";
@import "/modules/acidfree/acidfree.css";
@import "/modules/openid/openid.css";
@import "/themes/fourseasons/style.css";