The world is facing challenges with climate change and public health issues. Previous research suggest that a diet low in greenhouse gas emissions are rich in dietary fiber and meet recommended levels for most nutrients. The present thesis is a part of the CLEAR study; a randomized controlled trial aiming at investigating if climate friendly food habits have an impact on the composition of the microbiota and excretion of pesticides in urine. The specific aim of this thesis is to evaluate if education on climate friendly food habits will have an effect on the participants’ diet related greenhouse gas emissions and dietary fiber intake as compared to a control group. In addition, the correlation between diet-related greenhouse gas emissions and dietary fiber is examined. The results show a modest reduction in greenhouse gas emissions among the participants in the climate group. In addition, the climate friendly group increased their intake of dietary fiber, but the difference was not significant as compared to the control group. A linear, statistically significant, negative association was found between diet-related greenhouse gas emissions and dietary fiber intake in both groups. The transtheoretical model was chosen as a theoretical framework and are used to discuss the results.