Recent global warming mostly attributable to human activity?
 

Global warming controversy
http://en.wikipedia.org/wiki/Global_...sy#cite_note-0

"The global warming controversy is a variety of disputes regarding the
nature, causes, and consequences of global warming. The disputed
issues include the causes of increased global average air temperature,
especially since the mid-20th century, whether this warming trend is
unprecedented or within normal climatic variations, whether humankind
has contributed significantly to it, and whether the increase is
wholly or partially an artifact of poor measurements. Additional
disputes concern estimates of climate sensitivity, predictions of
additional warming, and what the consequences of global warming will
be. The controversy is significantly more pronounced in the popular
media than in the scientific literature, where there is a consensus
that recent global warming is mostly attributable to human activity.
[1]"

"Contents

1 History
1.1 Public opinion
1.2 Related controversies
2 Scientific
2.1 Consensus
2.2 IPCC
2.3 Greenhouse gases
2.4 Solar variation
2.5 Aerosols forcing
2.6 Instrumental temperature record
2.7 Climate sensitivity
2.8 Infrared iris hypothesis
2.9 Internal radiative forcing
2.10 Temperature predictions
2.11 Forecasts confidence
2.12 Models vs empirical forecasts
2.13 Arctic shrinkage
2.14 Antarctica cooling
2.15 Data archiving and sharing
3 Political
3.1 Kyoto Protocol
3.2 Funding for partisans
3.3 Changing positions of skeptics
3.4 Political pressure on scientists
3.5 Litigation
3.6 Betting
4 See also
5 References
6 Further reading
7 External links"

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My personal opinion -

a) The 5 climate datasets show global warming
over the past 30 years.

b) Among climate scientists there is sharp dispute whether most of the
recent global warming
is man-caused or natural cycle.

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What is the opinion of usenetters on a) and b)?

David Christainsen