I think you may have not entirely understood where he was going with that. It's a metaphor for entropy. It's actually a much more poignant and beautiful topic than something as short-term and universally inconsequential as climate change on earth.
I disagree- these mechanical people are well-nigh immortal and will leave to see the end of their world, no one alive today on earth will live to see the heat death of the universe. However, we might just get to experience the effects of climate change.
The beauty of literature is we can both the right - our interpretations of the work is what matters. Additionally, while they are inspired by them,authors do not necessarily do a 1:1 mapping of real world issues to their stories