20th Century climate IPCC conclusion

• The probability that climate change is due to human activities exceeds 90 %.

• The IPCC digital climate models projections indicate that greenhouse gas emissions are likely to cause important climatic disturbances, more important whereas the atmospheric concentration of greenhouse gases (GHGS) will be high.

• The climate was heated during the 20 century of 0.74 ° C in an overall average.

• This warming is greatly accelerated in the course of the fifty last years, with a rate of 0.13 °C per decade. The eleven of twelve recent years are listed at the top 12 hottest years since 1850.

• The Arctic pack ice melts more quickly.

• Sea level speed up at 0.17 m per century during the 20 th century and of 0.3 m per century between 1993 and 2003, that is twice the average recorded during the twentieth century.

• Increase of the number of intense tropical cyclone in the North Atlantic and other regions of the globe since 1970.

• Biodiversity is already seriously impacted.

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