Following the letters of Paul Biggs and Malcolm Heymer criticising the man-made climate change thesis (Letters LTT 12 Apr), and their many critics (LTT 26 Apr) I ask, does Malcolm Heymer not have a point when he refers to previous warm periods and the long-term downward temperature trend? The temperature chart for our current geologic period, the Holocene, says it all (see https://en.wikipedia.org/wiki/Holocene).
Further, why is it that a rise of 2°C above pre-industrial times is...
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