A Cycling & bikes forum. CycleBanter.com

Go Back   Home » CycleBanter.com forum » rec.bicycles » Social Issues
Site Map Home Register Authors List Search Today's Posts Mark Forums Read Web Partners

why did moths change color? was Do bicycles and cars mix?

Thread Tools Display Modes
Old July 18th 03, 08:50 AM
Dr Engelbert Buxbaum
external usenet poster
Posts: n/a
Default why did moths change color? was Do bicycles and cars mix?

Bob Bayn, Network & Computing Services wrote:

Actually, the moth "changed color to blend in"** with the natural
color of the bark of trees instead of the lighter color of the
lichens that used to grow on the trees. The pollution levels
killed off the lichen. It wasn't just black soot painting the

I am afraid you got it wrong here. The moth in question lives on birch
trees, and their bark is naturally white, only in heavily poluted areas
they are covered in black sot and dust.

Lichens btw are usually either green, yellow or red, not white. This is
quite logical too, a white lichen would reflect all light, and have no
energy source for photosynthesis.

May be you are not old enough to remember how things were in
industrialised areas before the environmental movement of the '70s. You
actually could not dry laundry outside: it would become black before it
became dry. There was a big political drive in those days under the
title "we want to see again the blue sky over the Ruhr (an area with a
lot of coal mining and iron smelting activity in Germany).

I remember train rides along the Rhine river, where we had to keep the
windows closed because of the sulfuric stench of the water, which was so
chemical loaded that bathing in the river was deadly (it was the then
German minister for environment Klaus Toepfer (now head of environmental
protection at the UN) who was the first to do so again in a publicity
heist after major international cleanup efforts. In the 19th century
there had been strikes by servants in cities like Colone because they
were given only cheap river salmon for food. Salmon became extinct in
the river in the 20th century because of pollution, only now they are
slowly returning.

Yes, quite a lot has been achieved in the last 30 years, but more needs
to be done. And a more considerate use of fossile fuels would be a good

Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

vB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Forum Jump

Similar Threads
Thread Thread Starter Forum Replies Last Post
Do bicycles and cars mix? wafflyDIRTYcatLITTERhcsBOX General 62 September 13th 03 03:24 AM

All times are GMT +1. The time now is 11:34 AM.

Powered by vBulletin® Version 3.6.4
Copyright ©2000 - 2022, Jelsoft Enterprises Ltd.
Copyright 2004-2022 CycleBanter.com.
The comments are property of their posters.