What roles does humans play in the carbon and nitrogen cycle?

Humans significantly influence both the carbon and nitrogen cycles through activities such as fossil fuel combustion, deforestation, and agricultural practices. In the carbon cycle, burning fossil fuels releases carbon dioxide into the atmosphere, contributing to climate change. In the nitrogen cycle, the use of synthetic fertilizers and the cultivation of nitrogen-fixing crops alter natural nitrogen processes, leading to increased nitrogen runoff and pollution in aquatic ecosystems. Overall, human activities disrupt these cycles, impacting ecosystems and global climate.