Clear signs of human influence in global warming
If Mr Crawley has been poring over the latest Intergovernmental Panel on Climate Change (IPCC) report so diligently, then he must have deliberately left out in his letter the following statement that says it all: “Human influence has been detected in the warming of the atmosphere and the ocean, in changes in the global water cycle, in reductions in snow and ice, in global mean sea level rise, and in changes in some climate extremes. It is extremely likely that human influence has been the dominant cause of the observed warming since the mid-20th century.”
Quoting from Chapter 1: “Even though the projections from the models were never intended to be predictions over such a short timescale, the observations through 2012 generally fall within the projections made in all past assessments.”
Typical of those suffering from denial syndrome, your correspondent seems to take comfort in the fact that 2017 is not as hot as 2015 and 2016.
According to the World Meteorological Organisation, 2017 is set to be among the top three hottest years, that is, the three hottest years on record, 2015, 2016 and 2017 – occurring in a row. The global average temperature for 2013-2017 is likely to be the highest five-year average on record.
Lee Sai Ming, senior scientific officer, Hong Kong Observatory