Global cool­ing

The Sunday Telegraph - - Letters to the editor -

SIR – Dr Bruce Den­ness (Let­ters, Jan­uary 28) claims that global tem­per­a­tures have risen by 0.25C since 2011.

What he does not men­tion is that tem­per­a­tures were de­pressed in 2011, be­cause of La Niña at that time.

In fact, ac­cord­ing to the HadCRUT4 dataset Dr Den­ness quotes, there has been no sta­tis­ti­cally mea­sur­able warm­ing at all since 2005.

Mean­while, global tem­per­a­tures have been steadily fall­ing in the last 12 months, as the ef­fects of the record El Niño of 2015-16 grad­u­ally wear off. Paul Home­wood

Sheffield, South York­shire

SIR – Dr Den­ness draws the wrong con­clu­sions about the ex­tremes of heat and cold cur­rently ex­pe­ri­enced in dif­fer­ent parts of the globe.

These lie within the his­tor­i­cally mea­sured tem­per­a­ture range and rep­re­sent nat­u­ral variability in the re­spec­tive cli­mate zones, telling us lit­tle about so-called global warm­ing or the role of CO2. Since cli­mate is a re­gional met­ric the con­cept of a global cli­mate is mean­ing­less.

I con­grat­u­late Dr Den­ness on the ac­cu­racy of the pre­dic­tions of his model. How­ever, I would be more con­vinced by his warn­ing of un­con­trolled warm­ing from 2030 if his model had not just pre­dicted the cur­rent tem­per­a­ture anom­aly but also the cool­ing re­quired to reach this fig­ure. Dr Eric Hux­ter

Ashtead, Sur­rey

SIR – I got a lit­tle lost when Dr Den­ness ac­cused Christo­pher Booker (The Last Word, Jan­uary 21) of cherry-pick­ing his facts on global tem­per­a­tures by se­lect­ing those in the north­ern hemi­sphere – but then went on to se­lect tem­per­a­tures in the south­ern hemi­sphere to sup­port his side of the ar­gu­ment. Brian Christ­ley

Abergele, Conwy

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