Stefan writes:

The point is, look at the climate then and what the effect of a tiny
change was. And then look at the much bigger climate change now. Now try
to think of the effects to be expected by this big change now when
already such a tiny change then caused oranges to grow in Ireland.

The only thing certain today is that temperatures are higher than they
were a few decades ago. The causes are unknown, the future trend is
impossible to determine. Human activity may or may not be a factor.
There is a consistent tendency among human beings to overestimate
their importance and influence on the biosphere, and this should be
kept in mind when speculating.

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