Summary:

- The article discusses how rising carbon dioxide (CO2) and nitrogen pollution are jointly threatening global biodiversity. Increased CO2 levels can lead to changes in plant growth and composition, while nitrogen pollution can disrupt natural ecosystems.

- The article highlights research showing that the combination of these two environmental stressors can have a more severe impact on plant and animal species than either factor alone. This can lead to the loss of biodiversity and the disruption of natural habitats.

- The article emphasizes the need for comprehensive strategies to address both CO2 emissions and nitrogen pollution in order to protect the Earth's ecosystems and the diverse range of plant and animal life they support.