Both major forms of lithium mining can have negative effects on the environment. When it comes to hard-rock lithium mining, there have been incidents of chemicals leaking into the water supply and damaging the local ecosystems; in addition, these operations tend to have a large environmental footprint. As mentioned, lithium brine extraction requires a lot of water for the evaporation process, but it's hard to understand the scope without numbers. It's estimated that approximately 2.2 million liters of water are required to produce 1 MT of lithium, and that can sometimes mean diverting water from communities that are experiencing drought conditions. This form of lithium extraction also affects the condition of the soil and air.