e that production of CFCs, CCl4, and halons will be completely halted by the year 2000. The phase out schedule for other compounds was accelerated by 4 years by the 1992 Copenhagan agreement. All human activity potentially contributes directly or indirectly to global change. Earth's atmosphere consists of a delicate balance of gases essential to life. Throughout the history of the planet, the atmospheric gases have been influenced by Earth processes and by the living organisms from both the oceans and land, and natural changes have occurred in the type of gases and their concentrations. (EPA 2000) Anthropogenic activities are now believed to be causing rapid changes in atmospheric composition on an accelerated time scale. (EPA 2000) Due to extended human life expectancies and greater population densities, the influence of humans will continue to grow. Scientists are now confident that stratospheric ozone is being depleted worldwide. However, how much of the loss is the result of human activity, and how much is the result of fluctuations in natural cycles, still need to be determined. To understand global atmospheric changes, we need to understand the composition and chemistry of Earth's atmosphere and how they are affected by human activity. To create accurate models, scientists must account for all of the factors affecting ozone creation and destruction, and conduct simultaneous, global studies over the course of many years. (EPA 2000)ConclusionThe ozone layer must continue to be protected and we, as individuals, need to take the right steps into preserving our atmosphere and environment by finding new ways to prevent the ongoing destruction that has been done to it. If everyone does his or her part to help, no matter how big or small, we can ensure that this problem will be solved....
