Firstly,
the overall warming of the globe of nearly 1 degree C since 1900 is hardly «slight».
Only about 2 % of the planet's overall warming heats the atmosphere, so if we focus only on surface air temperatures, we miss 98 % of
the overall warming of the globe.
Not exact matches
The January — December map
of temperature anomalies shows that
warmer - than - average temperatures occurred across the vast majority
of the
globe during 2015, combining to bring
overall record warmth for 2015, at 0.90 °C (1.62 °F) above the 20th century average.
Yes, the Arctic
warms and cools in consonant with the rest
of the
globe, but with much local excursions and plenty
of weather noise and cyclical climate perturbations contributing to the
overall picture.
This was due to a change in the Pacific Decadal Oscillation which entered its positive phase,
warming the tropics, the west coast
of North America and the
globe overall.»
My conclusion is that a careful observation
of weather patterns over the entire
globe and, in particular, ascertaining whether there is a net average surface movement
of air towards the poles or towards the equator should reveal whether there is an
overall global
warming or cooling trend at any particular time.
Here is what they say: «The balance between the cooling and
warming actions
of clouds is very close although,
overall, averaging the effects
of all the clouds around the
globe, cooling predominates.»