The Earth is experience a heating trend, but there is scientific evidence that this heating seems to be part of a 1,500-year cycle of moderate temperature sway. It has long been accepted that the Earth has experienced climate cycles, most notably the 90,000-year Ice Age cycles. But in the past 20 years or so, up to date science has discovered evidence that within those broad Ice Age cycles, the Earth also experiences 1,500-year warming-cooling cycles. Evidence of the global nature of the 1,500-year climate cycles includes very long-term proxies for temperature change – ice cores, seabed and lake sediments, and fossils of pollen grains and tiny sea creatures. Shorter-term proxies include cave stalagmites, tree rings from trees both living and buried, boreholes and a wide variety of other temperature proxies.
So, is the Earth currently experiencing a warming trend? Yes. Are human activities, including the burning of fossil fuel and forest conversion, the primary – or even significant – drivers of this current temperature trend? The scientifically appropriate answer – cautious and conforming to the known facts – is: We will see.
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