Facing life in a greenhouse

Is the much discussed greenhouse effect the disaster of the 21st century--a gradual warming of the earth that threatens life itself? Or is it a political tool for environmentalist doomsayers?

For 30 years, scientists have theorized that, as harmful gases accumulate in the atmosphere, the earth's blanket of air will become a global heat trap, triggering long-term and possibly cataclysmic changes in climate. Individual studies have tended to confirm the theory, but some scientists have taken sharp exception to a doomsday scenario, arguing that it is being used to generate research funding and to further the political objectives of environmental ...

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