> Great Britain would still be UK
No, it wouldn't. The term "UK" includes Northern Ireland while "GB" doesn't.
> Germany it would still be BRD
Before 1990 that would've been the common usage, simply because there were two "Germanies" at the time. Today, while technically still the correct denomination, "BRD" / "FRG" is equivalent to "Germany", which is why these terms can be used interchangeably (with the non-technical country name being much more common these days).
> America would be USA
Using "America" instead of "USA" is highly inaccurate, perhaps even offensive to people from other countries on that continent.
These distinctions are relevant. This is not some casual pub conversation but rather it's supposed to be a serious article on scientific and political issues. Therefore, diligence, getting the facts straight and using accurate terminology is important.