TO quote a phrase that seems appropriate given the current state of the Ouse: "It is one thing knowing water is wet, it is quite another to jump in and experience it."

I wonder how many of your readers share this sentiment with me in relation to global warming? While many scientists more eminent than I would point out that one warm month does not prove climate change, to state the obvious, hasn't January in York been unsettlingly odd?

As a member of Clifton Cycling Club, I occasionally train on the quiet early morning roads of our city in an attempt to get fit for the summer season.

At this time of year I would normally dress like an Eskimo for even the shortest of rides.

This January, however, feels more like early spring than winter and my dawn rides have been accompanied by birdsong.

Time, I think, only to follow leaders who take protecting our environment seriously, and only vote for politicians who have sound, evidence-based policies on climate change.

Professor Andy Smith, York St John University, Lord Mayor's Walk, York.