„It ain't what you don't know that gets you into trouble. It's what you know for sure that just ain't so.“ – Mark Twain Although awareness of global warming problem has risen among the population in the last decade, many are still neglecting it, by assumption that human beings can't significantly affect the ecosystem as a whole. While this claim was correct before the Industrial revolution, with modernization man has created that visibly influences functioning oft he Earth's ecosystem and its most sensitive part – atmosphere. Greenhouse gases in the atmosphere include : water vapour, carbon dioxide, methane, nitrogen oxides, ozone and CFC. The subject of study was to detect effects of global warming in the Kvarner bay area, while informations for this analysis was gained from comparing climate parameters, like sea and air temperature, precipitations depth, ozone concentrations over number of years. The result show that on average nearly all the above mentioned parameters have increased, especially in the last 20 years. Also, higher concentrations of ozone are observed in lower layers of the atmosphere and if longer maintained, they could adversely affect humans and vegetation. Some of the obvious consequences of global warming that can already be noticed are: even higher number of rainy days per year , longer summer with more dry periods, more variation in climate between months and years.