Earth receives energy from the sun and emits energy to space. More solar radiation is absorbed in the tropics than other regions. Energy is transported poleward by the atmosphere and ocean while changing its form. Once energy is averaged over the entire globe, the difference of received and emitted energy determines whether Earth is warming or cooling. Satellite observations indicate that, on average, Earth emits less energy than it receives in the last 16 years. As a result, Earth is warming at the rate of approximately 0.85 Wm^-2, most of which is used for warming ocean. Satellite observations also indicate that the rate of warming is increasing with time. In this presentation, I will present energy and entropy budgets of the climate system and an implication of increasing the rate of warming from a thermodynamic point of view.