The warming of oceans by greenhouse gases emitted by human activity has caused large-scale death of coral reefs. A hat tip to Dylan Thomas' 'Do Not Go Gentle Into That Dark Night', as I nicked his villanelle refrain.
Do not concede the gentle coral's grief
Attend the lessons nature has to teach
Rage, rage against the dying of the reef
Great oceans flow too warm and not too brief
So polyps spit out algae, turn to bleach
And gentle corals fade to death-white grief
Bird sings at midnight
Climate change, light pollution
Or just a daft cock?