> But then- "In the 1960s, the naturalist Derek Ratcliffe compared peregrine
> falcon eggs from historical collections with more recent egg-shell samples,
> and was able to demonstrate a decline in shell thickness.[3] This was found
> to cause the link between the use by farmers of pesticides such as DDT and
> dieldrin, and the decline of British populations of birds of prey."
>

some obvious problems with the above-

1. correlation is not causation
2. confirmation bias
3. Control the Variables! With a zillion variables between "historical
collections" and today, the study is not too scientifically rigorous.It
could easily be 'Climate Change" as the main reason because it can do
everything.
4. wikipedia is not too authoritative as a prime source.

Richard has more authority since he covers studies from then to now that
refute the hysteria of the times.

BTW- it is actually Climate Change that is causing the thickening of the
egg shells. Just think CO2 increase and calcium carbonate.  97% 0f
scientists agree.

Bill Truesdell
Bath, Maine

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