Does the meaning of words change over time?

What are these plots?

Meaning (semantics) can be influenced by context (pragmatics). What we have here are the top 5 words that cause a positive correlation to the overall semantics by their proximity to the keywords. As the words that have the most influence are mostly constant over time, this suggests a change in emotional response to the keywords over time. Notice anti-correlations.

What words are co-located with: australia, australian, aussie, australians

What words are co-located with: aboriginal, first nations, aborigine, indigenous, torres strait island

What words are co-located with: economy, economic

What words are co-located with: government: immigrant, asylum seeker, boat people, illegal arrivals, boat arrivals

What words are co-located with: fire, bushfire, climate change, climate action, extinction, global warming, greenhouse, emissions, environment, coral reef, reef, climate, degradation, sustainability