An interesting way of thinking about global warming involves the history of the planet. The earth is about 4.5 billion years old. Recognizable humans arose about 2.2 million years ago. Proper Homo sapiens only came into existence about 250,000 years ago. Given the changes that have provoked global warming in recent times, I think it is fair to say humans are definitely involved as we have not seen these kinds of changes prior to the existence of humans, which have only been on earth for a relatively short time.
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