Climate is always changing; warming or cooling on many time scales. So the overall warming of the 20th century could well be natural. On the other hand, the growing level of human activity, esp. generation of energy by fossil-fuel burning, has increased levels of atmospheric greenhouse (GH) gases, esp. carbon dioxide (CO2). So an anthropogenic cause is also plausible. How to decide? That’s the essence of the climate debate
S. Fred Singer is professor emeritus at the Univ of Virginia and director of the Science & Environmental Policy Project. His specialty is atmospheric and space physics. An expert in remote sensing and satellites, he served as the founding director of the US Weather Satellite Service and, more recently, as vice chair of the US National Advisory Committee on Oceans & Atmosphere.
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