John perkins mostly dealt with

energy infraction
desalination plants
nuclear weapons
weapon trade**********

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John Perkins, a former economic hitman and author, primarily dealt with economic issues and international development, particularly in his book "Confessions of an Economic Hitman." While he did not exclusively focus on any specific topic from the given options, his work extensively discussed the influence of corporate interests, political corruption, and the exploitation of resources in developing countries.

To gather more information about John Perkins and his work, you can follow these steps:

1. Start by conducting a general internet search for "John Perkins economist" or "John Perkins author." This will provide you with a range of sources, including his official website, interviews, articles, and books written by him.

2. Visit John Perkins' official website, if available. Here, you can find detailed information about his background, areas of expertise, and the topics covered in his books and lectures.

3. Explore articles and interviews related to John Perkins. Many reputable news outlets and platforms have covered his work extensively. Look for articles that discuss his views on economic hitmen, corporate corruption, and the exploitation of resources in developing countries.

4. Access his books, such as "Confessions of an Economic Hitman," which is his most well-known work. This book provides significant insights into his personal experiences and his understanding of global economic dynamics.

While John Perkins did touch upon geopolitical and military aspects in his writings, such as the impact of American foreign policy on developing nations, he did not specialize in areas like desalination plants, nuclear weapons, or weapon trade specifically.