Process:  - Several types of gases form in the atmosphere - May come from different sources - The gases remain trapped in the atmosphere - Through the suns light the gases hold in heat and energy - Trap them in our atmosphere - The earth may become warmer this way.  Perturbation hypothesis: suppose more plants use gases happens, how will it affect a SMALLER greenhouse effect.  Does the supposed perturbation have an effect (direct or indirect) on the process?
Answer:
yes