The high CO2 levels suggest there was a lot of oxygen (like earth) and a lot of carbon (like earth). The difference is, The C and the O have joined. For all we know, there was an advanced civilisation there, yet it would now be destroyed by nature.
@The-Con(View Post) Venus is just really old. Scientists say that earth will be like that in the future. For all we know, life may have flourished there once. It is so hot because it has so much CO2 and other pollutants
how did pollutants get into venus? Carbon Dioxide there is made naturally.