Which of these is responsible for the increase in average global temperatures?

Global warming is usually the reason for the increase of global temperatures

Explanation:

Global warming is the unusually rapid increase in Earth's average surface temperature over the past century primarily due to the greenhouse gases released as people burn fossil fuels

it takes hundreds of years to become stable.

if you have another question lmk.

in 1859, charles darwin set out his theory of evolution by natural selection as an explanation for adaptation and speciation. he defined natural selection as the "principle by which each slight variation [of a trait], if useful, is preserved".