Venus is the hottest planet in the solar system.
It's hotter than Mercury, which is much closer to the Sun than Venus. Why is this so? 90 atmospheres of carbon dioxide coat Venus' surface, keeping the temperature on the surface at an even 864 degrees Fahrenheit, or 462 degrees Celsius. Compare this with practically-no-atmosphere Mercury at only 800 degrees Fahrenheit during the day.
During the Cretaceous period here on Earth, between 145.5 to 65.5 million years ago, carbon dioxide levels in Earth's atmosphere were over 1,000 parts per million. That's up from where they are now, which is about 400 parts per million, and from where they used to be two centuries ago, which was about 280 parts per million. This was the period of natural history dramatized in the "Jurassic Park" books and movies. The Earth did not have icecaps during the Cretaceous period of natural history.
Venus and Cretaceous-period Earth are examples of the relationship between higher pressures of atmospheric carbon dioxide and higher average temperatures. Svante Arrhenius predicted this relationship in 1896. Capitalist industry has added 50% to Earth's atmospheric carbon dioxide endowment, and so we are currently in the era which awaits feedback from that increased level of atmospheric carbon dioxide.
So, as the Earth is physically converted into an instrument of industry, one pauses to think: why aren't we talking about this? Or, as Paul Street concludes:
The reigning political and media “elite” is happy to keep capitalogenic global warming on the public margins until long past the last ecological tipping points are passed. They can be counted on them to fiddle and diddle through the species’ final, fossil-fueled flame-out. It is an existential necessity to create a new culture, media, and politics with the elementary natural and social intelligence required to properly prioritize the most pressing problems of our time.