Climate change affecting plant nutrition

Increase in atmospheric carbon dioxide (CO₂) levels and global temperatures accelerating plant growth worldwide. Faster-growing plants often contain fewer nutrients, a trend known as nutrient dilution

Hyderabad: More than one-third of Earth’s animals, ranging from insects to large mammals, rely on plants as their primary food source. However, plants are low in calories, making it challenging for these herbivores to consume enough energy to sustain themselves. Climate change is compounding this issue by decreasing the nutritional quality of plant-based foods.

Human activities have increased atmospheric carbon dioxide (CO₂) levels and global temperatures, accelerating plant growth worldwide. While this phenomenon, known as the “greening of the Earth,” can store more carbon and potentially offset some greenhouse gas emissions, it comes at a cost. Faster-growing plants often contain fewer nutrients, a trend known as nutrient dilution.

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This decline in plant nutrition could significantly affect herbivores, from insects to giant pandas, by forcing them to spend more time foraging, thereby increasing their vulnerability to predators and environmental stressors. It can also reduce their growth, reproduction, and survival rates.

Research has already shown that climate change is diminishing the nutritional value of human food crops, with declines in vital micronutrients like iron, zinc, and magnesium. Similarly, livestock face challenges as protein levels in grasses are decreasing, impacting weight gain and profitability for ranchers. Wild species, such as giant pandas, are also affected. Rising temperatures are reducing the nutritional content of bamboo, their primary food source.

Insects, vital for pollination and food webs, are also impacted. Leaf-chewing insects, such as caterpillars and grasshoppers, experience reduced reproduction and body size due to nutrient-poor plants. Conversely, some insects like locusts may benefit from carbon-rich vegetation.

The effects of nutrient dilution are most pronounced in nutrient-poor areas like the Amazon and Congo basins and in smaller animals with higher metabolic demands. More research is needed to understand these impacts on ecosystems and food webs worldwide.