evidence: "Widespread and rapid changes in the atmosphere, ocean, cryosphere and biosphere have occurred. Human-caused climate change is already affecting many weather and climate extremes in every region across the globe. This has led to widespread adverse impacts and related losses and damages to nature and people." [...] In other words, the report states, "human-caused climate change is a consequence of more than a century of net GHG emissions from energy use, land-use and land use change, lifestyle and patterns of consumption, and production". [...] The increase in concentrations of GHGs in the atmosphere since around 1750 "are unequivocally caused by GHG emissions from human activities over this period", the IPCC says: