American Capitalist Imperialism extended all the way to Venus. Facinating!
The use of the phrase "global warming" is unfortunate -
"a runaway greenhouse effect" would more succinctly describe the interesting thing about the temperature of Venus.
Venus is 100's of degrees hotter than would be predicted solely by its distance from the sun. This is caused by its dense atmosphere of over 90% CO2. This was discovered in the 1970s (Carl Sagan is a famous contributor) and is not controversial.
Interestingly, it is thought that it was once much cooler, but that the positive feedback produced by increased temperatures from atmospheric CO2 caused more CO2 to be released from surface minerals, accelerating the process.