Check out this classic example of distorted logic :
To those of us living in Boulder and surrounding communities, it may come as a surprise that many people remain unconvinced that the use of fossil fuels is the main contributor to current climate change
An example of what happens when such concentrations are too high can be seen by looking at our planetary neighbor, Venus: the Venusian atmosphere is more than 96 percent carbon dioxide (compared to 0.038 percent on Earth), and the temperature can reach 460 C, which is hotter than your oven can get. On the other hand, the planet Mars has a very thin atmosphere is quite cold at -63 degrees C (-81 F). Venus, Earth and Mars are often referred to as the “Goldilocks” planets. Venus is the porridge that is too hot, Mars is porridge that is too cold and Earth is just right.
Mars also has 96% CO2 in its atmosphere and is brutally cold. The reason Venus is hot is because of the high atmospheric pressure, not the chemical composition of the atmosphere.