Vice President Al Gore, in a new foreword to his 1992 book Earth in the Balance, renews his call to eliminate all internal combustion engines and take dramatic steps to curb global warming. Gore’s best-selling book is being reissued next week to mark the 30th anniversary of the first Earth Day, and some Republicans are rejoicing at what they see as another opportunity to paint the vice president as an extremist. Enviros, however, say that the views Gore expresses in the book are becoming solidly mainstream, and they lament the fact that Gore hasn’t pushed an environmental agenda more strongly. In the new foreword, Gore takes a shot at Texas Gov. George W. Bush without naming him, by pointing out that Houston now has the worst air pollution in the U.S.