This figure shows the spring trends of phenology 1971-2000 grouped by their mean onset date. Each dot represents a station. Dot size adjusted for clarity. A negative phenological trend corresponds to an earlier onset of spring.
Estrella, Nicole, Sparks, Tim H. und Menzel, Annette, 2009, 'Effects of temperature, phase type and timing, location, and human density on plant phenological responses in Europe', Climate Research, 39(3), S.235–248.
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– 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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