record of oak-leafing dates tended to become earlier.

After 1960, the rate of warming accelerated, and this is mirrored by increasing earliness of oak leafing, recorded in the data collected by Jean Combes in Surrey. Over the past 250 years, the first leafing date of oak appears to have advanced by about 8 days, corresponding to overall warming on the order of 1.5 °C in the same period.

Towards the end of the 19th century, the recording of the appearance and development of plants and animals became a national pastime and,

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