As the United States shifts towards electric cars, the question of their environmental impact has come to the forefront. 

While electric cars produce zero emissions while in operation, the process of producing the electricity to charge them can have significant environmental consequences.

The majority of electricity in the United States is generated by burning fossil fuels such as coal and natural gas. 

This means that even if an electric car is producing zero emissions, the power plant producing the electricity to charge it may be polluting the air and contributing to climate change.

Additionally, the mining of the materials used to produce electric car batteries can have devastating effects on the environment. 

The mining of lithium and cobalt, which are key ingredients in electric car batteries, can lead to habitat destruction, water pollution and even human rights abuses.

Furthermore, the end of life of the electric car batteries also poses an environmental hazard, as they contain toxic and flammable materials. 

The proper disposal of these batteries is crucial to protecting the environment.

In conclusion, while electric cars have the potential to greatly reduce emissions and improve air quality, the shift towards them must be done in a way that takes into account their entire lifecycle, from production to disposal.

The United States must focus on sourcing electricity from renewable sources, and properly disposing of batteries to minimize the environmental impact of this transition.