Thermodynamics of photosynthesis has been a subject of interest to the scientific community; it is, therefore, addressed in this paper. This work reveals that traditional thermodynamic relationships may be used to calculate and project photosynthesis. Solar energy is required for the chemical reaction of green matter production. When the size of the green matter expands, less solar energy is received by the surroundings and more chemical energy is stored in plants and vegetation. If everything else is the same, the increase in the chemical energy produced is equal to the decrease in the heat of the biosphere and vice versa. Photosynthesis expansion is thus equivalent to heat transfer from the biosphere to the green matter. Plants surrounding air may be assumed as a heat reservoir at air dry bulb temperature, T_db. The colder air enclosed by the space of the green matter may be assumed as a cold reservoir at air wet bulb temperature, T_wb, and photosynthesis may be represented by a Carnot engine cycle. The thermal efficiency of the cycle is equal to 1-(T_wb/T_db)^0.5. If everything else is the same, the difference, T_db-T_wb, is a limiting factor of terrestrial photosynthesis. Based on this understanding, equations to predict growth of the green matter and tree diameter are derived and validated based on observations. Other findings include photosynthesis global average thermal efficiency is between 0.61% and 0.72%, and seasonal greening is nearly 0.80%. Neglecting deforestation, surface greening trend with climate change is between 0.23% and 0.28% annually.

光合作用的热力学一直是科学界关注的主题。因此，本文将对此进行讨论。这项工作表明，传统的热力学关系可以用来计算和预测光合作用。太阳能是生产绿色物质的化学反应所必需的。当绿色物质的规模扩大时，周围环境所吸收的太阳能就会减少，而植物和植被中就会存储更多的化学能。如果其他所有条件都相同，则产生的化学能的增加等于生物圈热量的减少，反之亦然。因此，光合作用的扩展等同于从生物圈到绿质的热传递。周围空气中的植物可以假定为空气干球温度T _db时的蓄热器。绿豆空间所包围的冷空气可以假定为湿球温度T _wb下的冷库，光合作用可以用卡诺（Carnot）发动机循环来表示。该循环的热效率等于1-（T _wb / T _db）^0.5。如果其他所有内容都相同，则区别为T _db -T _wb是陆地光合作用的限制因素。基于这种理解，基于观察结果推导并验证了预测绿色物质和树木直径增长的方程式。其他发现包括光合作用，全球平均热效率在0.61％至0.72％之间，季节性绿化率接近0.80％。忽略森林砍伐，随气候变化的地表绿化趋势每年在0.23％至0.28％之间。