The article argues that Karl Marx's theory of value helps us understand how capitalism exploits both workers and the environment. The author defends Marx's theory by explaining that it doesn't prioritize workers over nature, but rather shows how capitalist value harms both. The study uses examples from the nitrogen fertilizer industry to support this argument. Marx's theory suggests that nature's degradation under capitalism is due to how value is created through labor. This challenges environmental economic valuation schemes that focus on consumption/exchange. The author concludes by advocating for a "value theory of nature" based on Marx's ideas.