Given a list of steps and an additional step, determine where the step fits into the original list of steps. A correct answer, correctly places the given step into the set of steps so that it creates a new plausible set of steps. Output must be formatted as 'After step n', where n is the step number after which the given additional step is to be inserted.
Q: Steps: (1) Human beings burn fossil fuels (oil, gas, etc.) (2) The make-up of the atmosphere changes (3) Some energy from the sun cannot escape back through the changed atmosphere (4) The earth begins to heat because of the extra trapped energy (5) Human beings cut down trees (6) Human beings do not re-plant the trees (7) Trees cannot help take the extra carbon dioxide from the atmosphere (8) The extra trapped energy starts to change the earth&#x27;s short term weather (9) Eventually the long-term climate patterns start to change  
Where does the following step fit into the given list of steps: Carbon dioxide from the burning fossil fuels enter the atmosphere 
A: 
 After step 1. 