IPCC, Climate Change 2013: The Physical Science Basis

IPCC Climate Change 2013

Executive Summary
Human Effects on Climate

Human activities are continuing to affect the Earth’s energy budget by changing the emissions and resulting atmospheric concentrations of radiativel y important gases and aerosols and by changing land surface properties. Previous assessments have already shown through multiple lines of evidence that the climate is changing across our planet, largely as a result of human activities. The most compelling evidence of climate change derives from observations of the atmosphere, land, oceans, and cryosphere. Unequivocal evidence from in situ observations a nd ice core records shows that the atmospheric concentrations of important greenhouse gases such as carbon dioxide, methane, and nitrous oxides have increased over the last few centuries. [1.2.2, 1.2.3]

The processes affecting climate can exhibit consid erable natural variability. Even in the absence of external forcing, periodic and chaotic variations on a vast range of spatial and temporal scales are observed. Much of this variability can be represented by simple (e.g., unimodal or power law) distributions, but many components of the climate system also exhib it multiple states – for instance, the glacial-interglacial cycles and certain modes of internal variability such as El Niño-Southern Oscillation (ENSO). Movement between states can occur as a result of natural variability, or in response to external forcing. The relationship between variability, forcing and response reveals the complexity of the dynamics of the climate system: the relationship between forcing and response for some parts of the system seems reasonably linear; in other cases this relationship is much more complex. [1.2.2]

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Sobre Antonio Carlos Teixeira

Executivo de Comunicação I Assessor Estratégico I Sustentabilidade/Baixo Carbono I Editor I Editor do blog TerraGaia //// Executive of Communication I Strategic Advisor I Sustainability/Low Carbon I Editor I TerraGaia blog Editor.
Esse post foi publicado em Aquecimento global, Carbono, Clima, Climate Change, Consciência ambiental, Gases do Efeito Estufa, Human activities and climate change, Impactos ambientais, Mudança climática, Pesquisas ambientais, Publicações e marcado , , , , . Guardar link permanente.

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