The annual deviations shown in the chart have been adjusted to be relative to the period 1850-1899 (for Hadley Centre/CRU) and 1880-1899 (for NASA/GISS) to better monitor the EU objective not to exceed 2 ºC above pre-industrial values. Over Europe average annual temperatures during the real pre-industrial period (1750-1799) were very similar to those during 1850-1899.
– to verify whether it isn't poisoning the air in your home or consuming too much energy. Have it replaced once every 15 years – to benefit from the technological advances that render new boilers more energy-efficient.
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