A popular quote ….
Best to reply with graphs and charts.
Annual ……from NASA Institute for Space Studies (GISS)
Note ….. every La Nina ‘year’ since 1998 was warmer than every El Nino ‘year’ before 1995. (Hat-tip to greenveggie for this observation)
Decadal….. from the World Meteorological Organisation
Of course, ‘climate’ is conventionally an average over 3 full decades…..
For example the UK Met Office climate averages for 1981-2010