Try again, mathematics is not a science, it is a system of abstractions employing logic through self-referent and consistent axioms and definitions.
Mathematics - Wikipedia, the free encyclopedia
Actually the most important element of science, is the data, the measurements, the empiric evidences. The explanations are merely the tools used to categorize, and relate the data. This is why explanations change as understandings grow and are enhanced, but the data always stays the same.
an assertion without support
The IPCC statement that Global Warming is "unequivocal" is a reference to the planetary temperature record, specifically of the last 30 years, which demonstrate "without any equivocation" that the planet has experienced an increase in warming over the prior 30 year period. But just to be clear, I do not see the term "unequivocal" used in the IPCC report. Is this Trenberth's qualification or the IPCC's finding? If IPCC statement, please cite and reference.
(Equivocate - beat around (or about) the bush, hem and haw, straddle the fence)
Trenberth himself acknowledges and agrees with this in the very link you present
http://ams.confex.com/ams/91Annual/webprogram/Manuscript/Paper180230/ClimategateThoughts4AMS_v3.pdf
And the actual IPCC statement: -
http://www.ipcc.ch/pdf/assessment-report/ar4/wg1/ar4-wg1-spm.pdf
asserting, without substantive support, that something is so, and then using that assertion as evidence of verification is also known as a circular argument, and is generally as valid as the circular filing cabinet in which such are typically stored.
please do feel free to respond with actual supporting evidence and compelling discussion when you acquire such.