It is best to step back and look at a longer term
trend than concentrate on a single decade.
Not exact matches
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The annual API goals stress a
trend toward improvement more
than they
concentrate on any absolute achievement score.
Human induced
trend has two components, namely (a) greenhouse effect [this includes global and local / regional component] and (b) non-greenhouse effect [local / regional component]-- according to IPCC (a) is more
than half of global average temperature anomaly wherein it also includes component of volcanic activities, etc that comes under greenhouse effect; and (b) contribution is less
than half — ecological changes component but this is biased positive side by urban - heat - island effect component as the met network are
concentrated in urban areas and rural - cold - island effect is biased negative side as the met stations are sparsely distributed though rural area is more
than double to urban area.
If we then assume that nearly all of any urban effect will be
concentrated in the calm nights, which were defined as the calmest third of nights, then overall urbanisation
trends of about 0.03 deg C per decade (a bit more
than a third of 0.078 deg C per decade) in minimum temperature should be readily detectable.
If a clean and transparent record still shows the kind of multi-decadal cyclical warming
trends we see in the current surface records, then they are likely to have been meaningful, and we should try to understand them, rather
than simply
concentrating essentially all of our efforts on the last warming cycle.