Answer:
Burning of fossil fuels
Explanation:
Over the last 200 years, burning of fossil fuels has been the major source of carbon emission. Here, atmospheric concentrations of 12C, 13C, and 14C refers to the carbon isotopes (12C, 13C and 14C) and therefore the statement refers to carbon emissions. It is now no surprise that carbon concentrations in the atmosphere is responsible for the environmental changes and that fossil fuel burning is the reason behind increased atmospheric carbon concentrations as proven by scientific research.
It was a act of war and made them angry cuse countries in Europe recognized the USA as legit for example the Netherlands
I believe the answer is: Familiarity
In this context, familiarity refers to psychological phenomenon that cause people to develop preference toward a certain thing because they see it often.
This happen when people experience repeated exposure toward things and started to develop interest/attraction toward that thing.