The people pushing the Anthropogenic Climate Change bull-crap use the numbers from their computer models for evidence. They do not use real data gathered from the real world for some strange reason. Might be because the Modern Warm Period has come to an end and we have not had any appreciable warming for about 20 years.
This data is from messurements taken in the field by various arrays of sensors - both atmospheric, satellite (radar) and oceanic. Add Bird Migration to the mix - from Phys Org:
Migratory birds arriving late to breeding grounds
New research shows climate change is altering the delicate seasonal clock that North American migratory songbirds rely on to successfully mate and raise healthy offspring, setting in motion a domino effect that could threaten the survival of many familiar backyard bird species.
A growing shift in the onset of spring has left nine of 48 species of songbirds studied unable to reach their northern breeding grounds at the calendar marks critical for producing the next generation of fledglings, according to a paper published today in Nature Scientific Reports.
And the mechanism:
Birds leave their winter homes in Central and South America for the north based on the seasonal shift in hours of daylight, a cue unaltered by climate change. To produce healthy young, they must arrive at their breeding grounds to take advantage of the early-season boom in insects that emerge with springtime plant growth.
But as climate change shifts the timing of when plants put out new leaves – a temperature-driven process known as green-up – migrating birds become more likely to reach breeding grounds when temperatures are still frigid and food is scarce or after insect numbers have begun to dwindle.
Interesting. Another nail in the coffin.
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