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Early indications of climate change include penguin poo and starving humming birds arriving in bare pastures, once filled with an early flowering species. High altitude pilots struggled to understand why albatrosses were flying round around the planet within a month. Then the penny dropped: the birds were not consciously flying any faster, but the high altitude winds, the jet stream, had accelerated by about 20%. If you get a chance see the 2023 TV series Evolution Earth, seize the opportunity.