Quote:
Originally Posted by
Boh_So_Good
GLOBAL WARMING is what they said we were getting until the global temp stopped rising in 1998.......
It the notion that humans are raising world temp with C02 which remains unproven.
Read the IPCC reports in full. They are all "may lead to", "is a possible issue" and so on and yet we get press confs were they come out and say that there is total scientific agreement on the issue when there isn't.
A link to the USA's Environmental Protection Agency - from their front page on the "Future Climate Change" section.
Quote:
Increased greenhouse gas concentrations are very likely to raise the Earth's average temperature, influence precipitation and some storm patterns as well as raise sea levels (IPCC, 2007)
as you can see, an IPCC is quoted.
Here is a link to some IPCC reports - http://ipcc-wg1.ucar.edu/wg1/wg1-report.html
Here are some excerpts from the "Frequently Asked Questions" section -
Quote:
What Factors Determine Earth’s Climate?
There are three fundamental ways to change the
radiation balance of the Earth: 1) by changing the incoming solar
radiation (e.g., by changes in Earth’s orbit or in the Sun itself); 2)
by changing the fraction of solar radiation that is reflected (called
‘albedo’; e.g., by changes in cloud cover, atmospheric particles or
vegetation); and 3) by altering the longwave radiation from Earth
back towards space (e.g., by changing greenhouse gas concentrations).
Climate, in turn, responds directly to such changes, as well
as indirectly, through a variety of feedback mechanisms.
The key point here is point 3.
Quote:
How do Human Activities Contribute to Climate Change
and How do They Compare with Natural Influences?
Human activities contribute to climate change by causing
changes in Earth’s atmosphere in the amounts of greenhouse gases,
aerosols (small particles), and cloudiness. The largest known
contribution comes from the burning of fossil fuels, which releases
carbon dioxide gas to the atmosphere. Greenhouse gases and aerosols
affect climate by altering incoming solar radiation and out-
going infrared (thermal) radiation that are part of Earth’s energy
balance. Changing the atmospheric abundance or properties of
these gases and particles can lead to a warming or cooling of the
climate system. Since the start of the industrial era (about 1750),
the overall effect of human activities on climate has been a warming
influence. The human impact on climate during this era greatly
exceeds that due to known changes in natural processes, such as
solar changes and volcanic eruptions.
Look at that last sentence again - the human impact on climate during this era greatly exceeds that due to known changes in natural processes
Here are some excerpts from Section 9 - "Understanding and Attributing Climate Change" -
Quote:
It is extremely unlikely (<5%) that the global pattern of warming during the past half century can be explained without
external forcing, and very unlikely that it is due to known
natural external causes alone. The warming occurred in both the
ocean and the atmosphere and took place at a time when natural
external forcing factors would likely have produced cooling.
Quote:
Greenhouse gas forcing has very likely caused most of the
observed global warming over the last 50 years.
(Words in italics are from the report, not my editing)
From section 10 - "Global Climate Predictions" -
Quote:
Temperature Extremes
It is very likely that heat waves will be more intense, more
frequent and longer lasting in a future warmer climate. Cold
episodes are projected to decrease signifi cantly in a future warmer
climate. Almost everywhere, daily minimum temperatures are
projected to increase faster than daily maximum temperatures,
leading to a decrease in diurnal temperature range. Decreases
in frost days are projected to occur almost everywhere in
the middle and high latitudes, with a comparable increase in
growing season length.
Quote:
Snow and Ice
As the climate warms, snow cover and sea ice extent
decrease; glaciers and ice caps lose mass owing to a dominance
of summer melting over winter precipitation increases. This
contributes to sea level rise as documented for the previous
generation of models in the TAR. There is a projected reduction
of sea ice in the 21st century in both the Arctic and Antarctic
with a rather large range of model responses. The projected
reduction is accelerated in the Arctic, where some models project
summer sea ice cover to disappear entirely in the high-emission
A2 scenario in the latter part of the 21st century. Widespread
increases in thaw depth over much of the permafrost regions
are projected to occur in response to warming over the next
century.
I would argue that the pieces of the IPCC reports I've quoted paint a very different picture of both the existence of and reasons for climate change and global warming than you suggest, Boh so Good.