Marx's ecology - this term sounds like an oxymoron. Did not Marx advocate for absolute human dominion over nature? In light of today's global ecological crisis, it is indisputable to analyze this in close connection with the capitalist system. Therefore, updating Marx's theory is essential for shaping a broad "red" and "green" movement in the 21st century. Kohei Saito systematically reconstructs the unfinished Marxian ecological critique of capitalism based on the new Marx-Engels complete works edition. This edition reveals unknown scientific excerpts from Marx as well as his attempt to address the contradiction of capitalism as an ecological crisis.