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Letters to the Editor, December 24, 2013

I refer to the letter by G. Bailey ("Still a lot of doubts about climate change", December 17) in reply to my letter ("Deniers hurt climate change awareness", December 7).

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Long wait in the city's public hospitals. Photo: Felix Wong

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I refer to the letter by G. Bailey ("Still a lot of doubts about climate change", December 17) in reply to my letter ("Deniers hurt climate change awareness", December 7).

I would like to emphasise again that the latest Intergovernmental Panel on Climate Change (IPCC) report is the result of a collaborative compilation effort of some 260 scientists from about 40 countries, in which more than 9,200 scientific papers were cited. Backed by a huge amount of peer-reviewed scientific evidence, the report represents the consensus of the climate science community. To negate or dispute the conclusions of the report would require something much more than unsubstantiated claims.

Deniers like to focus on short-term fluctuations because it is easy to cherry-pick data they want. If we look at the earth's climate from a long-term perspective, almost the whole globe experienced warming in the last 112 years. The first decade of the 21st century has been the warmest decade since instrumental records began. A recent study revealed that the long-term cooling trend in the last 5,000 years was totally reversed by an abrupt warming trend in the most recent 100 years (Observatory's blog: www.hko.gov.hk/blog/en/archives/00000146.htm

The Summary for Policymakers (SPM) of the latest IPCC report highlighted observed changes that are unprecedented over decades to millennia. One of the most worrying observations is that the current atmospheric carbon dioxide concentration is unprecedented over the last 800,000 years. The SPM also gives a concise account on the temperature trend in the last 15 years, although 15 years are normally regarded as too short for meaningful discussion on the long-term climate and climate change.

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