Elements that cycle in the environment and that also have a gaseous phase at some point in their cycle include what?

Carbon, nitrogen and sulphur.

Explanation:

In carbon cycle, carbon dioxide is in the gaseous form in atmosphere. This gaseous carbon dioxide is emitted in the atmosphere through combustion of fossils, respiration, decomposition. In nitrogen cycle, atmospheric nitrogen is in the gaseous form which is emitted through denitrification. In sulphur cycle, sulphur is in the form of gaseous sulphur dioxide in the atmosphere. This sulphur is emitted in the atmosphere by the volatilization of hydrogen sulphide.

co2reflects heat radiation back to earth buning coal and oil emits co2 globe warms

it doesn't. it was imagined up in the middle ages.