General objective of this lecture is to describe on Super Greenhouse and Acid Rain. The high level of CO2 and its distance from the Sun have lead to a super greenhouse effect and Sulphuric Acid Rain. The present level of Oxygen in the atmosphere is balanced at a such a level that less would impede survival of a number of organisms while more would lead to a greater probability of fires. This lecture also briefly focus on Ozone Layer. Ozone in the Stratosphere; 16 – 50km above the Earth’s Surface.