Identify the essential facts related to German philosopher George Friedrich Hegel.

A. Hegel popularized the idea of climate change mitigation.

B. Hegel's version of idealism is known as dialectical idealism.

C. Hegel sought to describe the dialectical process in terms of thesis, antithesis and synthesis.

D. Hegel authored the book 'Phenomenology of Spirit'.

E. Karl Marx was highly influenced by Hegel.

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