... and they are also simply that :
projections with as much 'reality-worth' as other projections.
Unfortunatly nature (including astro-mechanics =>
Three-Body-Problem) doesn't work along linear ways but on exponetial as well as threshold (straw-that-breaks-a-camels-back) as well as on chaotic combinations of all of these. And in terms of climate you have rathe a ...
few more factors/bodies to incorporate.
Good luck on your next holiday at the Maledives during monsoon-period ...
... because "we" were actually looking and researching into that direction due to the horrors of racism encountered with WW1, interwar period and WW2. ... though ... there were still quite some 'research' into the opposite direction after WW2 ... with some prison-inmates in the US of A i.e., trying to find correlations between ethnical origins, blood types and criminality rates.
You know what intelligence tests test ?
Not intelligence.
Only whats asked in their [everytime different] question
Scientific research of whatever kind mostly finds only what you ask for. And if you ask for "
race doesn't matter" than you will find such results or interprete their results accordingly. ... unfortunatly it works the other way around also.
ITTL there are many more 'studies' imaginable, that show into the other direction with the 'proper' study design regarding 'racial differences' and their effects on creating 'superior' culture and civilization ... whatever you determine as 'superior'.