Is There a More Effective Proof of Global Warming Madness?

4/16/18 U.K. Metro:

Fifty-six million years ago, the Earth warmed far above the temperatures we experience today – and ice at the poles melted.

Could the event – the Paleocene-Eocene Thermal Maximum (PETM) – be evidence of global warming caused by an extinct civilisation which ruled Earth before mankind? It sounds like the kind of crackpot conspiracy to be found on ‘ancient alien’ UFO sites, but scientists have seriously investigated the idea. Professor Adam Frank of the University of Rochester writes in The Atlantic that the investigation could offer insight into how to find alien life – or about our impact on our planet. Frank writes, ‘There is a conundrum here. If an earlier species’s industrial activity is short-lived, we might not be able to easily see it. ‘The PETM’s spikes mostly show us the Earth’s timescales for responding to whatever caused it, not necessarily the timescale of the cause.

Read more: http://metro.co.uk/2018/04/16/another-civilisation-earth-humans-scientists-investigate-7470510/?ito=cbshare
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Or evidence that dramatic changes in climate happen even without fossil fuels.