Correct Answer: Decreased rate of photosynthesis in vegetation

Solution : The correct option is Decreased rate of photosynthesis in vegetation.

The least likely impact of global warming is a decrease in the rate of photosynthesis in plants.  While reduced photosynthesis in plants may have an impact on numerous elements of ecosystems and biodiversity, it is less likely to be a direct outcome of global warming. Indeed, greater temperatures and increased carbon dioxide levels, which are frequently connected with global warming, have the potential to improve photosynthesis in some plants. However, other factors such as water availability, nutrient levels, and ecosystem health can all have a substantial impact on photosynthetic rates.