[1. Venus Was Not Caused By Global Warming
Tyson assures us right away that we are to “question everything” so we have to ask why he thinks Venus is the way it is due to the greenhouse effect — which is another way of saying global warming. Venus is almost 900 degrees Fahrenheit and the clouds are sulfuric acid. Even the most aggressive climate change models and their 20-foot ocean rises don’t predict that for Earth, no matter how many Chevy Volts we don’t buy. ]
Venus is hot because it lack plate techtonics so it resurfaces itself every 100 million years or so as there is no outlet for the core heat in the planet until it all belches forth. Also this action causes a LOT of outgassing which is WHY it has such a dense atmosphere over 100X as much pressure as earth.
Also the Sulfur Dioxide clouds in the upper atmosphere actually Reflect somewhere upwards of 90% of the light and heat FROM the sun...
If Venus had an atmosphere that was our pressure and still had the same percentage of CO2 in it’s atmosphere and had a dead core... IT would most certainly be FROZEN!!!!
I think Venus is so hot because it rotates so very slowly.
Planets do not have an ‘average’ temperature, they have TWO average temperatures - a day temperature and a night temperature.
Look at the lunar day/night temperatures for the best example of what Earths temperatures would be without rapid rotation and atmosphere.
The rotation on Venus is so slow, that any Ocean would be boiled off during the very long day.
The huge day/night difference will cause enormous storms as the atmosphere seeks to redistribute the heat.
Just as our seasons are caused by the TILT of the Earth, Venus’s hot temperatures are caused by her lack of rotation.