I am not sure if Americans are "falling behind" in that we train and employ scientifically literate students and workers from other areas of the world...so, as a country, the United States still...
In regard to your last question Bart, exact measurements or even estimates of volcanic outputs (and many times this is true of human emissions as well) are very difficult...generally, scientists...
I'm not sure I understand your question. You are right, humans and hominids undoubtedly shared (and share) the earth with large animals (for example, giant Ground Sloths and Imperial Mammoths) but...
I think that site staff should cite sources when they answer questions with new info, doesn't need to be a link or anything, just so folks know where the new info came from...
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