Land-locked Botswana has sought alternative routes to export its coal as disruption to South Africa's railway lines impact the commodity's route to Richards Bay port.
After years of decline, demand for the polluting fossil fuel has surged this year as Europe scrambles to replace Russian gas, and coal miners are making money hand over fist.
A report by the Environmental Integrity Project and Earthjustice found that 96% of the 265 power plants that are contaminating groundwater in the US are not proposing any treatment plan.