“Climate Change 2013: The Physical Science Basis” presents clear and
robust conclusions in a global assessment of climate change science—
not the least of which is that the science now shows with 95 percent
certainty that human activity is the dominant cause of observed warming
since the mid-20th century. The report confirms that warming in
the climate system is unequivocal, with many of the observed changes
unprecedented over decades to millennia: warming of the atmosphere
and the ocean, diminishing snow and ice, rising sea levels and increasing
concentrations of greenhouse gases. Each of the last three decades
has been successively warmer at the Earth’s surface than any preceding
decade since 1850.
These and other findings confirm and enhance our scientific understanding
of the climate system and the role of greenhouse gas emissions;
as such, the report demands the urgent attention of both policymakers
and the general public.

Stocker, T.F., D. Qin, G.-K. Plattner, M. Tignor, S.K. Allen, J. Boschung, A. Nauels, Y. Xia, V. Bex and P.M. Midgley (eds.)