Global warming is a phenomenon that emerges with the first industrial revolution, and year after year the changes are becoming more visible and serious. Climate change refers to any long-term changes in the Earth's climate, the region's climate, or the city's climate. These changes include heating, cooling and temperature-related changes. Humans affect the climate in various ways such as deforestation and increasing arable land, consumption of fossil fuels in energy production, transport, agriculture and so on. Human activity has been shown to be a major cause of global warming. The aim of this thesis is to examine the knowledge and attitudes of high school students on the impact of climate change. The students who participated in the survey are 4th grade students of Ivan Švear General High School in Ivanic-Grad and Matija Mesić High School in Slavonski Brod. The questionnaire was anonymous and was conducted among 190 respondents. The introductory part of the thesis will give a brief overview of weather and climate, climate change, the greenhouse effect, why climate change is one of the problems addressed by bioethics, and some ways to combat climate change. The central part of the paper will interpret the results of the survey. In addition to presenting the results of the survey, each question is further substantiated by past knowledge of a particular problem. The results of the research themselves show that students are aware that climate change is happening and that something needs to be done, but they are not sufficiently aware of the climate change problem itself. They also list good ways to reduce greenhouse gas emissions.