Monthly Archives: February 2015

What causes Global Warming?

Global warming is caused by two types of forcings: natural forcing, which involves solar cycles and the Milankovitch cycles ; and anthropogenic forcing, which is human-based. In this article, we’ll discuss anthropogenic forcing, as it accounts for more than half of the current global warming, according to IPCC’s 5th Assessment Report.  The contributions of the two forcings (anthropogenic and natural) to global warming are represented on the graph below.

IPCC_forcings_globalwarming

This graph uses data from climate model simulations and observations to estimate the contribution of each forcing (natural and anthropogenic). The total anthropogenic contribution to global warming is estimated in orange (Combined anthropogenic forcings) and the natural contribution is estimated in blue (Natural forcings). Source: IPCC 5th Assessment Report, Working Group I.

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