The correct answer is option 3 - Both 1 and 2.

Statement 1 is correct because coal based power plants are known to emit mercury into the environment. When coal is burned, it releases mercury into the atmosphere, which can then be deposited onto land or water bodies, causing pollution and harm to ecosystems and human health.

Statement 2 is also correct. The Minamata Convention refers to an international treaty that aims to phase out the use of mercury and mercury-based products. The convention was named after the Minamata disease, which was caused by mercury pollution in Minamata Bay, Japan, resulting in severe neurological and physical disorders.

It is important to note that coal-based power plants are a significant source of mercury emissions, and reducing these emissions is one of the objectives of the Minamata Convention. Therefore, both statements 1 and 2 are correct as they highlight the relationship between coal-based power plants and mercury emissions, as well as the objectives of the Minamata Convention.