The source highlights microplastics, tiny plastic particles, as a significant global environmental and health concern due to their widespread presence in ecosystems and the human body, including recent findings confirming their existence in the human brain. The text explains what microplastics are, how they might reach the brain, and potential health risks such as inflammation and neurodegenerative issues. It also discusses the challenges in studying these effects, the broader implications for public health, and suggests various actions at individual, policy, and technological levels to mitigate the impact of microplastics and address plastic pollution.