Here. You’ll now be impressed with my deep knowledge.
http://report.ipcc.ch/sr15/pdf/sr15_ts.pdf
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1.5°C and 2°C warmer worlds
The global climate has changed relative to the preindustrial period with multiple lines of evidence that these changes have had impacts on organisms and ecosystems, as well as human systems and well-being (high confidence). The increase in global mean surface temperature (GMST), which reached 0.87°C in 2006-2015 relative to 1850-1900, has increased the frequency and magnitude of impacts (high confidence), strengthening evidence of how increasing GMST to 1.5°C or higher could impact natural and human systems (1.5°C versus 2°C) {3.3.1, 3.3, 3.4, 3.5, 3.6, Cross- Chapter Boxes 6, 7 and 8 in this Chapter}.
Human-induced global warming has already caused multiple observed changes in the climate system (high confidence). In particular this includes increases in both land and ocean temperatures, as well as more frequent heatwaves in most land regions (high confidence). There is also high confidence that it has caused an increase in the frequency and duration of marine heatwaves. Further, there is evidence that global warming has led to an increase in the frequency, intensity and/or amount of heavy precipitation events at global scale (medium confidence), as well as having increased the risk of drought in the Mediterranean region (medium confidence) {3.3.1, 3.3.2, 3.3.3, 3.3.4}.
Changes in temperature extremes and heavy precipitation indices are detectable in observations for the 1991-2010 period compared with 1960-1979, when a global warming of approximately 0.5°C occurred (high confidence). The observed tendencies over that time frame are consistent with attributed changes since the mid-20th century (high confidence) {3.3.1, 3.3.2, 3.3.3}.
There is no single ‘1.5°C warmer world’ (high confidence). Important aspects to consider (beside that of global temperature) are the possible occurrence of an overshoot and its associated peak warming and duration, how stabilization of global surface temperature at 1.5°C is achieved, how policies might be able to influence the resilience of human and natural systems, and the nature of the regional and sub-regional risks (high confidence). Overshooting poses large risks for natural and human systems, especially if the temperature at peak warming is high, because some risks may be long-lasting and irreversible, such as the loss of many ecosystems (high confidence). The rate of change for several types of risks may also have relevance with potentially large risks in case of a rapid rise to overshooting temperatures, even if a decrease to 1.5°C may be achieved at the end of the 21st century or later (medium confidence). If overshoot is to be minimized, the remaining equivalent CO2 budget available for emissions is very small, which implies that large, immediate, and unprecedented global efforts to mitigate greenhouse gases are required (high confidence) {Cross-Chapter Box 8 in this Chapter; Sections 3.2 and 3.6.2}.
Substantial global differences in temperature and extreme events are expected if GMST reaches 1.5°C versus 2°C above the preindustrial period (high confidence). Regional surface temperature means and extremes are higher at 2°C as compared to 1.5°C for oceans (high confidence). Temperature means and extremes are higher at 2°C as compared to 1.5°C global warming in most land regions, and display in some regions 2-3 times greater increases when compared to GMST (high confidence). There are also substantial increases in temperature means and extremes at 1.5°C versus present (high confidence) {3.3.1, 3.3.2}.
Substantial changes in regional climate occur between 1.5°C and 2°C (high confidence), depending on the variable and region in question (high confidence). Particularly large differences are found for temperature extremes (high confidence). Hot extremes display the strongest warming in mid-latitudes in the warm season (with increases of up to 3°C at 1.5°C of warming, i.e. a factor of two) and at high-latitudes in the cold season (with increases of up to 4.5°C at 1.5°C of warming, i.e. a factor of three) (high confidence). The strongest warming of hot extremes is found in Central and Eastern North America, Central and Southern Europe, the Mediterranean region