Single ecological system, wrapped in an atmospheric envelope: clean, dry air at earth"s surface consisting of, 78% n, 21% o, 1% ar, 0. 04% co2, 0. 00005% ozone. Large-scale atmospheric and oceanic phenomena influence the ecological system on a global scale: rapid pace of global change through human activities alter, climate, biogeochemical cycles (n, co2), land use. Review: carbon cycle, c moves quickly between organisms and the atmosphere via photosynthesis and respiration. Co2 effect on temperature: [co2] varied substantially over time but temp has always varied directly with it. Increase has been ~277 ppm: co2 began to increase exponentially in the middle 1800s. Co2 effects: temperature increase, rising sea level, melting of snow and ice, increase in climate and weather events, outlook not good. Spread of disease (some are only limited by t, so can spread as t increases) Large-scale atmospheric and oceanic phenomena with global influences on weather, climate and ecology.