I recently took pictures of one of these butterflies myself. It was feeding on the nectar of the flowers on some kind of bush.These butterflies are not uncommon in the upper great lakes region where I live, but I don't see as many as I used to. I'm not sure what kind of plants their caterpillars feed on, hopefully not tomato plants. :-)
I think the warming of the oceans in the far northern and southern lattitudes has as much to do with the loss of plankton as anything else, but I do think that the increase in UV rays is affecting plant life in a not so good way.
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I remember seeing some really big worms when I lived in the Midwest, that would munch on an entire tomato plant if you didn't remove them. I have not seen any of those so far in the Pacific Northwest. There are other things that make tomato growing hard around here though.
There is always a bit of a compromise when you love both tomatoes and the worms that change into butterflies.
UV rays are really tough on people too. My friend just had a skin cancer removed yesterday.