.05 is a deemed level within blood for alcohol so a person can still drive a car?. It is not that the person will catch fire or die or the world will end, such as what you think will happen if co2 gets to 500ppm.
Which will then change to 600, and once at 600 will change to 700, because each time the world will end it will not and you and your kind will keep changing the number. Just as you did with Oil and when it would end and the world would end, the time just kept changing.
