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marshallz10

Climate change sceptics

marshallz10
18 years ago

I ran across reference to this essay on the Real Climate blog and thought some of you might be enlighted by Dr Rahnstorf's insights.

The climate sceptics

Media reports repeatedly focus on sceptics.

Some of them do not believe in climate

change,others attribute it to natural causes,

and others consider it harmless or even

favourable.How seriously should we take

these theories?

Stefan Rahmstorf

Many aspects of the climate system are still insufficiently

understood and are the subject of ongoing research and

scientific discussion.One example is the mechanism of

abrupt climate changes that have occurred repeatedly in

earth s history,and the causes of which are still being

debated >Rahmstorf "Abrupt climate change ",p.70 .

On the other hand,some important core findings of

climate research have been so well confirmed in recent

decades that they are generally accepted as facts by

climate researchers.These core findings include the

following:

1 The atmospheric CO2 concentration has risen strongly

since about 1850,from 280 ppm (a value typical for

warm periods during at least the past 400,000 years)to

380 ppm.

2 This rise is caused by humans and is primarily due to

the burning of fossil fuels,with a smaller contribution

due to deforestation.

by the German,Austrian,and Swiss meteorological soci-

eties),the scientific Advisory Council on Global Change

(WBGU)set up by the German government,and others.

All of these bodies have again and again arrived at the

same key conclusions.

Anyone relying on the media for information,however,

could get a completely different impression:namely that

the above core conclusions of the scientific community

are still disputed or regularly called into question by new

studies.This is mainly due to the untiring PR activities

of a small,but vocal mixed bag of climate sceptics (or

"contrarians ")who vehemently deny the need for climate-

protection measures.

The various climate sceptics hold very different positions.

We can distinguish trend sceptics (who deny there is

global warming),the attribution sceptics (who accept the

global warming trend but see natural causes for this),and

the impact sceptics (who think global warming is harm-

less or even beneficial).

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