From the first paragraph
"Global surface temperature has increased 0.2°C per decade in the
past 30 years, similar to the warming rate predicted in the 1980s in
initial global climate model simulations with transient greenhouse
gas changes. Warming is larger in the Western Equatorial Pacific
than in the Eastern Equatorial Pacific over the past century, and we suggest that the increased West–East temperature gradient may have increased the likelihood of strong El Niños , such as those of
1983 and 1998. Comparison of measured sea surface temperatures
in the Western Pacific with paleoclimate data suggests that this
critical ocean region, and probably the planet as a whole, is
approximately as warm now as at the Holocene maximum and
within1°C of the maximum temperature of the past million years.
We conclude that global warming of more than 1°C, relative to
2000, will constitute ‘‘dangerous’’ climate change as judged from
likely effects on sea level and extermination of species."
I've bolded the relevant sentence.
Is this more Butterfly effect?