99% of "99% of so and so say" statistics are probably intended to be taken as a synonym for "the majority of so and so say."
Wiki:
The finding that the climate has warmed in recent decades and that
human activities are already contributing adversely to global climate
change has been endorsed by every national science academy that has issued a statement on
climate change, including the science academies of all of the major industrialized
countries.[27]
With the release of the revised statement by the American Association
of Petroleum Geologists in 2007[28],
no remaining scientific society is known to reject the basic findings
of human influence on recent climate change.[29]
Environmental groups, many governmental reports, and the media in all
countries but the United States[30][31][32] often state that there is
virtually unanimous agreement in the scientific community in support of
human-caused global warming. Opponents either maintain that most
scientists consider global warming "unproved," dismiss it altogether, or
highlight the dangers of focusing on only one viewpoint in the context
of what they say is unsettled science, or point out that science is
based on facts and not on opinion polls.
On April 29, 2008, environmental journalist Richard Littlemore
revealed that a list of "500 Scientists with Documented Doubts of
Man-Made Global Warming Scares"[33]
distributed by the Heartland Institute included at
least 45 scientists who neither knew of their inclusion as "coauthors"
of the article, nor agreed with its contents.[34]
Many of the scientists asked the Heartland Institute to remove their
names from the list. The institute refused these requests, stating that
the scientsts "have no right - legally or ethically - to demand that
their names be removed."[35]
In 1997, the "World Scientists Call For Action" petition was
presented to world leaders meeting to negotiate the Kyoto Protocol. The declaration asserted, "A broad
consensus among the world's climatologists is that there is now ‘a
discernible human influence on global climate.’" It urged governments to
make "legally binding commitments to reduce industrial nations'
emissions of heat-trapping gases", and called global warming "one of the
most serious threats to the planet and to future generations."[36]
The petition was conceived by the Union of Concerned Scientists
as a follow up to their 1992 World Scientists' Warning
to Humanity, and was signed by "more than 1,500 of the world's most
distinguished senior scientists, including the majority of Nobel
laureates in science."[37][38]"
