Vote yes for global warming |

Vote yes for global warming

Dear Editor:Recent discussions of the advent of the global warming crisis require the application of some historical perspective.Our current period of global warming did not start in the 1960s, as the environmentalists would have us believe. About 30,000 years ago, the earth’s climate warmed abruptly and dramatically, probably caused by an increase in solar output, resulting in the end of the melting of the Pleistocene ice caps about 15,000 years ago. The ice caps began to form at the end of the Pliocene epoch, 2 million years ago. The ice caps covered up to one-half of the surface of the earth, to an average depth of up to one mile; their onset was probably caused by the impact of an asteroid or asteroids into an ocean and the subsequent reduction of solar heating of the surface. Other prolonged periods of abrupt global cooling and mass extinction occurred at the end of the Permian period, 230 million years ago and the end of the Cretaceous period, 63 million years ago. The Gulf of Campeche remains as an asteroid impact crater from the Cretaceous Impact.With the warming of the global climate, the stage was set for the advent of man and his civilization. If not for the global warming at the end of the Pleistocene, the sparse human population of the world would today be living much as they were then, as hunters and gatherers in caves and crude shelters, feasting on mammoths and mastodons at the edges of the vast continental ice sheets.The melting of the continental ice sheets formed the modern outlines of the continents as they are today. Sea level was 300 feet lower then, than it is today. Bermuda was not an island. The present site of Miami was 300 feet above sea level and it was dry.From the historical perspective, we are currently in another of a continuing series of warm interglacial periods, which are not the earth’s normal climate. I vote YES for global warming!Hugh A. RobertsSnowmass