In traditional context, fossil fuel energy consumption is observed as non-renewable sources and contributing its major part for the energy source in the world economy. However, a new term under the title of renewable energy source is also examined and studied too. The focus of this paper is to investigate the impact of fossil fuel energy and renewable energy sources on the factor of climate change. For the measurement of climate change, overall six dimensions were added in the empirical analyses. The time period for the study was 1987 to 2013 and data was collected from World Development Indicator WDI. Findings for the regression analyses reveal that climate change in terms of CO 2 emissions from liquid fuel consumption (kt) or C 1 is directly influenced by both fossil and renewable energy, and same trend is found for CO 2 emissions (kt); C 2 . Meanwhile, the third indicator of climate change C 3 or CO 2 emissions (kg per 2010 US$ of GDP) is negatively affected by renewable energy. Furthermore, C 4 (CO 2 emissions from gaseous fuel consumption [% of total]) is directly influenced by both of the energy sources in Thailand. Additionally, the trends in C 5 is found to be positively determined by both fossil fuel and renewable energy, while their negative and significant impact is observed for C 6 ; CO 2 emissions from transport (% of total fuel combustion). Future research studies may consider the sub division of energy sources in both public and private sectors.