Task: Sentence Ordering
Input (English): 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 
Output (English):  After step 1.